Truck Laws by State: Speed Limits, Chain Laws and Idling Rules

Truck speed limit Verified

70 mph on interstates for all vehicles; no separate truck limit in the state table.

70 MPH Interstate

Alabama Law Enforcement Agency speed limit table (Code of Ala. 32-5A-171). Official source. Checked Oct 24, 2026.

Chain and traction law Unverified

Not yet confirmed from official text. Check the state source before you rely on it.

No official source linked yet. Checked Oct 24, 2026.

Idling limit No state law found

No statewide idling law listed in the US DOE Alternative Fuels Data Center compilation (checked Oct 2026)

Local rules may apply.

US DOE Alternative Fuels Data Center, AL laws list. Official source. Checked Oct 24, 2026.

Truck speed limit Verified

55 mph on roadways other than alleys and business or residential districts, unless a different limit is posted. No truck clause in this section.

(4) 55 miles per hour on any other roadway.

13 AAC 02.275. Official source. Checked Oct 24, 2026.

Chain and traction law Verified

No standing chain mandate. Chains are allowed for snow and ice, but chains and studded tires are banned on paved roads in summer windows. Drivers must obey posted CHAINS REQUIRED signs.

AS 28.35.155; 13 AAC 03.005. Official source. Checked Oct 24, 2026.

Idling limit No state law found

No statewide idling law listed in the US DOE Alternative Fuels Data Center compilation (checked Oct 2026)

Local rules may apply.

US DOE Alternative Fuels Data Center, AK laws list. Official source. Checked Oct 24, 2026.

Truck speed limit Verified

65 mph on rural interstates for all motor vehicles; the director may raise it to 75. No truck clause in this section.

A.R.S. 28-702.04. Official source. Checked Oct 24, 2026.

Chain and traction law Verified

Chains are permitted when needed; no statute requires them. Drivers must obey posted chain signs (A.R.S. 28-644).

A.R.S. 28-958. Official source. Checked Oct 24, 2026.

Idling limit No state law found

No statewide idling law listed in the US DOE Alternative Fuels Data Center compilation (checked Oct 2026)

Local rules may apply.

US DOE Alternative Fuels Data Center, AZ laws list. Official source. Checked Oct 24, 2026.

Truck speed limit Verified Separate truck limit

Commercial motor vehicles are capped at 70 mph on controlled-access highways where the limit is raised to 75 for other traffic.

Act 784 of 2019 (amending A.C.A. 27-51-201). Official source. Checked Oct 24, 2026.

Chain and traction law Unverified

Not yet confirmed from official text. Check the state source before you rely on it.

No official source linked yet. Checked Oct 24, 2026.

Idling limit No state law found

No statewide idling law listed in the US DOE Alternative Fuels Data Center compilation (checked Oct 2026)

Local rules may apply.

US DOE Alternative Fuels Data Center, AR laws list. Official source. Checked Oct 24, 2026.

Truck speed limit Verified Separate truck limit

55 mph for a truck or truck tractor with 3 or more axles, or any truck drawing another vehicle, on any highway.

No person may drive any of the following vehicles on a highway at a speed in excess of 55 miles per hour: (a) A motortruck or truck tractor having three or more axles or any motortruck or truck tractor drawing any other vehicle.

Cal. Veh. Code 22406 (quoted by Caltrans). Official source. Checked Oct 24, 2026.

Chain and traction law Verified

When chain controls are posted, trucks over 6,500 lb gross must chain up; snow tires do not exempt them.

Cal. Veh. Code 605; Caltrans chain controls. Official source. Checked Oct 24, 2026.

Idling limit Verified

Diesel vehicles over 10,000 lb GVWR: no more than 5 minutes idling at any location.

13 CCR 2485. Official source. Checked Oct 24, 2026.

Truck speed limit Verified

Maximum lawful speed is 75 mph; no statewide truck limit. CDOT posts lower limits for vehicles over 26,000 lb GVWR on listed mountain descents (I-70 at Glenwood Canyon, Vail Pass, the Eisenhower-Johnson Tunnels, Georgetown Hill, Floyd Hill and Mount Vernon Canyon; US 160 at Wolf Creek Pass). Trash trucks over 20,000 lb on a single rear axle: 45 mph.

The department of transportation shall not set a speed limit on interstate 70 for commercial vehicles or any other motor vehicle that differs from the highest authorized speed for any other type of motor vehicle on the same portion of a highway by more than twenty-five miles per hour.

C.R.S. 42-4-1101, 42-4-1102; CDOT Variable Speed Limits Guidelines (Nov 2023), Table 7. Official source. Checked Oct 24, 2026.

Chain and traction law Verified

On I-70 (Dotsero to Morrison) from Sept 1 to May 31, commercial vehicles must carry chains or approved devices and use them when the chain law is in effect.

C.R.S. 42-4-106; 2 CCR 601-14. Official source. Checked Oct 24, 2026.

Idling limit No state law found

No statewide idling law listed in the US DOE Alternative Fuels Data Center compilation (checked Oct 2026)

Local rules may apply.

US DOE Alternative Fuels Data Center, CO laws list. Official source. Checked Oct 24, 2026.

Truck speed limit Verified Truck limit unverified

Limits up to 65 mph may be set on multiple-lane limited-access highways; 55 elsewhere unless posted. The State Traffic Administration may set differing limits for different types of vehicles. Trucks pay higher speeding fines.

differing limits may be established for different types of vehicles

Conn. Gen. Stat. 14-218a, 14-219. Official source. Checked Oct 24, 2026.

Chain and traction law Unverified

Not yet confirmed from official text. Check the state source before you rely on it.

No official source linked yet. Checked Oct 24, 2026.

Idling limit Verified

No vehicle may idle more than 3 consecutive minutes when not in motion, with exemptions.

RCSA 22a-174-18(b)(3)(C). Official source. Checked Oct 24, 2026.

Truck speed limit Verified Truck limit unverified

55 mph on 4-lane and divided roadways and 50 on 2-lane roadways unless posted; DelDOT must post 65 mph on SR 1 between Red Lion Creek and the Appoquinimink River; other higher limits are set by posting. No fixed truck limit in the statute.

(5) 55 miles per hour on 4-lane roadways and on divided roadways.

21 Del. C. 4169. Official source. Checked Oct 24, 2026.

Chain and traction law No state law found

No chain law found. State law permits tire chains of reasonable proportions when needed for snow or ice but does not require them.

tire chains of reasonable proportions may be used upon any vehicle when required for safety because of snow, ice or other conditions tending to cause a vehicle to slide or skid

21 Del. C. 4302. Official source. Checked Oct 24, 2026.

Idling limit Verified

Heavy-duty vehicles over 8,500 lb GVWR: no more than 3 consecutive minutes.

7 DE Admin. Code 1145. Official source. Checked Oct 24, 2026.

Truck speed limit Verified

20 mph on all streets and highways unless otherwise designated; 15 mph in alleys. No truck clause on this page.

On all streets and highways, unless otherwise designated, the maximum lawful speed is 20 mph.

DDOT speeding laws page (18 DCMR 2200). Official source. Checked Oct 24, 2026.

Chain and traction law Unverified

Not yet confirmed from official text. Check the state source before you rely on it.

No official source linked yet. Checked Oct 24, 2026.

Idling limit Verified

No more than 3 minutes while parked, stopped or standing; 5 minutes below 32 F.

motor vehicles powered by gasoline or diesel are not allowed to idle for more than three minutes while the vehicle is parked, stopped or standing.

20 DCMR 900. Official source. Checked Oct 24, 2026.

Truck speed limit Verified

70 mph on limited access highways, 65 on 4-lane divided rural highways; DOT max 60 on others. No truck clause.

Fla. Stat. 316.187. Official source. Checked Oct 24, 2026.

Chain and traction law No state law found

No chain law found. The state motor vehicle agency says Florida does not allow tire chains; only tires with rubber studs designed to improve traction are permitted.

Florida does not allow tire chains.

Fla. Stat. 316.299 (FLHSMV icy conditions page). Official source. Checked Oct 24, 2026.

Idling limit No state law found

No statewide idling law listed in the US DOE Alternative Fuels Data Center compilation (checked Oct 2026)

Local rules may apply.

US DOE Alternative Fuels Data Center, FL laws list. Official source. Checked Oct 24, 2026.

Truck speed limit Verified

70 mph on rural interstates, 65 on urban interstates and multi-lane divided highways, 55 in other areas, unless posted. The manual lists no separate truck limit.

70 miles per hour on a rural interstate

Georgia DDS Drivers Manual, Speed Limits (O.C.G.A. 40-6-181). Official source. Checked Oct 24, 2026.

Chain and traction law Verified

When GDOT limits access to a road during a declared weather emergency, commercial vehicles (other than buses) with four or more drive wheels must chain at least four drive wheel tires; buses at least two. Fines up to $1,000 if the driver causes a crash or blocks traffic.

Operators of commercial vehicles (other than buses) with four or more drive wheels traveling on a road declared as limited access due to inclement winter weather conditions shall affix tire chains to at least four of the drive wheel tires.

O.C.G.A. 32-6-5 (Georgia DPS Fact Sheet 08B). Official source. Checked Oct 24, 2026.

Idling limit No state law found

No statewide idling law listed in the US DOE Alternative Fuels Data Center compilation (checked Oct 2026)

Local rules may apply.

US DOE Alternative Fuels Data Center, GA laws list. Official source. Checked Oct 24, 2026.

Truck speed limit Verified Truck limit unverified

No numeric maximum in this section. Maximum and minimum limits are set by county ordinance or by official signs placed by the state director of transportation. Obey the posted limit.

where the maximum or minimum speed limit is established by county ordinance or by official signs placed by the director of transportation on highways under the director's jurisdiction

HRS 291C-102. Official source. Checked Oct 24, 2026.

Chain and traction law Unverified

Not yet confirmed from official text. Check the state source before you rely on it.

No official source linked yet. Checked Oct 24, 2026.

Idling limit Verified

No idling in loading, parking, service or terminal areas, except listed cases (3-minute limits for loading passengers and start-up or cool-down).

HAR 11-60.1-34. Official source. Checked Oct 24, 2026.

Truck speed limit Verified

75 mph on interstates (80 after a department study) and 65 on state highways (70 after a study). Since July 1, 2026, vehicles with 5 or more axles over 26,000 lb have the same limits as other vehicles.

(3) For vehicles with five (5) or more axles operating at a gross weight of more than twenty-six thousand (26,000) pounds, the maximum lawful speed limits on interstate highways, in nonurban areas, in urban areas, on state highways, or in other locations shall be the same as for vehicles with less than five (5) axles and operating at a gross weight of twenty-six thousand (26,000) pounds or less.

Idaho Code 49-654 (as amended by 2026 Sess. Laws ch. 108, H.B. 664). Official source. Checked Oct 24, 2026.

Chain and traction law Verified

ITD may require chains on non-exempt commercial vehicles at Lookout Pass on I-90.

Idaho Code 49-948. Official source. Checked Oct 24, 2026.

Idling limit No state law found

No statewide idling law listed in the US DOE Alternative Fuels Data Center compilation (checked Oct 2026)

Local rules may apply.

US DOE Alternative Fuels Data Center, ID laws list. Official source. Checked Oct 24, 2026.

Truck speed limit Verified Separate truck limit

70 mph on interstates for any vehicle. In Cook, DuPage, Kane, Lake, McHenry and Will counties, vehicles of 8,001 lb or more are limited to 60 mph on interstates and 55 on other roads outside urban districts.

the maximum speed limit outside an urban district for a second division vehicle designed or used for the carrying of a gross weight of 8,001 pounds or more ... is 60 miles per hour on any interstate highway

625 ILCS 5/11-601(d-1), (e). Official source. Checked Oct 24, 2026.

Chain and traction law Unverified

Not yet confirmed from official text. Check the state source before you rely on it.

No official source linked yet. Checked Oct 24, 2026.

Idling limit Verified

In Chicago and Metro East areas, diesel vehicles of 8,000 lb or more: no more than 10 minutes in any 60 (30 minutes while waiting to load or unload).

may not cause or allow the motor vehicle, when it is not in motion, to idle for more than a total of 10 minutes within any 60 minute period

625 ILCS 5/11-1429. Official source. Checked Oct 24, 2026.

Truck speed limit Verified Separate truck limit

70 mph on rural interstates; 65 mph for vehicles (other than buses) over 26,000 lb declared gross weight.

Sixty-five (65) miles per hour for a vehicle (other than a bus) having a declared gross weight greater than twenty-six thousand (26,000) pounds on a highway on the national system of interstate

IC 9-21-5-2. Official source. Checked Oct 24, 2026.

Chain and traction law No state law found

No chain law found. State law permits tire chains of reasonable proportions when needed for snow or ice but does not require them.

Tire chains of reasonable proportions may be used upon a vehicle when required for safety because of snow, ice, or other conditions tending to cause a vehicle to skid.

IC 9-19-18-3. Official source. Checked Oct 24, 2026.

Idling limit No state law found

No statewide idling law listed in the US DOE Alternative Fuels Data Center compilation (checked Oct 2026)

Local rules may apply.

US DOE Alternative Fuels Data Center, IN laws list. Official source. Checked Oct 24, 2026.

Truck speed limit Verified

70 mph on interstates for all vehicular traffic; 65 on other controlled-access highways.

Iowa Code 321.285. Official source. Checked Oct 24, 2026.

Chain and traction law No state law found

No chain law found. State law permits tire chains of reasonable proportions when needed for snow or ice but does not require them.

Tire chains of reasonable proportions upon any vehicle when required for safety because of snow, ice, or other conditions tending to cause a vehicle to skid.

Iowa Code 321.442. Official source. Checked Oct 24, 2026.

Idling limit No state law found

No statewide idling law listed in the US DOE Alternative Fuels Data Center compilation (checked Oct 2026)

Local rules may apply.

US DOE Alternative Fuels Data Center, IA laws list. Official source. Checked Oct 24, 2026.

Truck speed limit Verified

75 mph on separated multilane highways; 65 other highways; 55 county roads. No truck clause.

K.S.A. 8-1558. Official source. Checked Oct 24, 2026.

Chain and traction law No state law found

No chain law found. State law permits tire chains of reasonable proportions when needed for snow or ice but does not require them.

tire chains of reasonable proportions upon any vehicle when required for safety because of snow, ice or other conditions tending to cause a vehicle to skid

K.S.A. 8-1742. Official source. Checked Oct 24, 2026.

Idling limit No state law found

No statewide idling law listed in the US DOE Alternative Fuels Data Center compilation (checked Oct 2026)

Local rules may apply.

US DOE Alternative Fuels Data Center, KS laws list. Official source. Checked Oct 24, 2026.

Truck speed limit Verified

65 mph on interstates and parkways; listed segments may go to 70. No truck clause.

Sixty-five (65) miles per hour on interstate highways and parkways

KRS 189.390. Official source. Checked Oct 24, 2026.

Chain and traction law No state law found

No chain law found. State law regulates chained wheels (no chains on ice-free roads unless on an ice shoe; cross chains no thicker than 3/4 inch) but does not require chains.

No person shall use on a highway not covered with ice, a vehicle with a chained wheel, unless the wheel rests upon an ice shoe at least six (6) inches wide.

KRS 189.190. Official source. Checked Oct 24, 2026.

Idling limit No state law found

No statewide idling law listed in the US DOE Alternative Fuels Data Center compilation (checked Oct 2026)

Local rules may apply.

US DOE Alternative Fuels Data Center, KY laws list. Official source. Checked Oct 24, 2026.

Truck speed limit Verified

70 mph on interstate or controlled-access highways; 65 on multilane divided highways. No truck clause.

No person shall operate a vehicle on any interstate or controlled access highway of this state in excess of seventy miles per hour.

La. R.S. 32:61. Official source. Checked Oct 24, 2026.

Chain and traction law No state law found

No chain law found. State law permits tire chains of reasonable proportions when needed to prevent sliding or skidding but does not require them.

Use tire chains of reasonable proportions upon any vehicle, when required for safety because of conditions tending to cause a vehicle to slide or skid.

La. R.S. 32:362. Official source. Checked Oct 24, 2026.

Idling limit No state law found

No statewide idling law listed in the US DOE Alternative Fuels Data Center compilation (checked Oct 2026)

Local rules may apply.

US DOE Alternative Fuels Data Center, LA laws list. Official source. Checked Oct 24, 2026.

Truck speed limit Verified

45 mph on public ways outside business and residential districts unless otherwise posted; higher interstate and turnpike limits are set by posting. No truck clause in this section.

Forty-five miles per hour on all other public ways unless otherwise posted.

29-A M.R.S. 2074(1)(D). Official source. Checked Oct 24, 2026.

Chain and traction law No state law found

No chain law found. State law permits tire chains of reasonable proportions when needed for snow, ice or slippery conditions but does not require them.

The use of tire chains of reasonable proportions when required for safety because of snow, ice or other slippery conditions.

29-A M.R.S. 2381. Official source. Checked Oct 24, 2026.

Idling limit Verified

Commercial vehicles: no more than 5 minutes in any 60-minute period, with exemptions.

An owner or operator of a commercial motor vehicle may not cause or permit such a vehicle to idle for more than 5 minutes in any 60-minute period

38 M.R.S. 585-L. Official source. Checked Oct 24, 2026.

Truck speed limit Verified

Limits above 70 mph may not be set; limits above 55 only on interstates or expressways. No truck clause.

Md. Transp. 21-801.1. Official source. Checked Oct 24, 2026.

Chain and traction law No state law found

No chain law found. State law permits tire chains of reasonable proportions when needed for snow or ice but does not require them.

It is permissible to use tire chains of reasonable proportions on any vehicle when required for safety because of snow, ice, or other conditions tending to cause a vehicle to skid

Md. Transp. 22-405.2. Official source. Checked Oct 24, 2026.

Idling limit Verified

No more than 5 consecutive minutes when not in motion, with exemptions.

A motor vehicle engine may not be allowed to operate for more than 5 consecutive minutes when the vehicle is not in motion

Md. Transp. 22-402. Official source. Checked Oct 24, 2026.

Truck speed limit Verified

Prima facie limits: 50 mph on divided highways outside thickly settled or business districts, 40 on other ways outside them, 30 inside them; posted limits apply elsewhere. No truck clause in this section.

if a motor vehicle is operated on a divided highway outside a thickly settled or business district at a rate of speed exceeding fifty miles per hour for a distance of a quarter of a mile

M.G.L. c. 90 s. 17. Official source. Checked Oct 24, 2026.

Chain and traction law Unverified

Not yet confirmed from official text. Check the state source before you rely on it.

No official source linked yet. Checked Oct 24, 2026.

Idling limit Verified

No unnecessary idling over 5 minutes, with exemptions.

in excess of five minutes

M.G.L. c. 90 s. 16A. Official source. Checked Oct 24, 2026.

Truck speed limit Verified Separate truck limit

Where the posted limit is over 65, trucks of 10,000 lb or more and truck-tractors may not exceed 65 mph on limited access freeways and state trunk lines.

MCL 257.627(4). Official source. Checked Oct 24, 2026.

Chain and traction law No state law found

No chain law found. State law permits a tire chain of reasonable proportion when needed for snow or ice but does not require it.

A person may also use a tire chain of reasonable proportion upon a vehicle when required for safety because of snow, ice, or other condition tending to cause a vehicle to skid.

MCL 257.710. Official source. Checked Oct 24, 2026.

Idling limit No state law found

No statewide idling law listed in the US DOE Alternative Fuels Data Center compilation (checked Oct 2026)

Local rules may apply.

US DOE Alternative Fuels Data Center, MI laws list. Official source. Checked Oct 24, 2026.

Truck speed limit Verified

70 mph on rural interstates, 65 on urban interstates. No truck clause.

Minn. Stat. 169.14. Official source. Checked Oct 24, 2026.

Chain and traction law No state law found

No chain law found. State law permits tire chains of reasonable proportions when needed for snow or ice but does not require them.

tire chains of reasonable proportions upon any vehicle when required for safety because of snow, ice, or other conditions tending to cause a vehicle to skid

Minn. Stat. 169.72. Official source. Checked Oct 24, 2026.

Idling limit No state law found

No statewide idling law listed in the US DOE Alternative Fuels Data Center compilation (checked Oct 2026)

Local rules may apply.

US DOE Alternative Fuels Data Center, MN laws list. Official source. Checked Oct 24, 2026.

Truck speed limit Verified Truck limit unverified

70 mph on interstates (40 mph minimum), per the state driver manual table. The table is for passenger vehicles; it does not state a separate heavy-truck limit.

Interstates 70 mph 40 mph

MDPS Driver's Manual (Miss. Code 63-3-501). Official source. Checked Oct 24, 2026.

Chain and traction law Unverified

Not yet confirmed from official text. Check the state source before you rely on it.

No official source linked yet. Checked Oct 24, 2026.

Idling limit No state law found

No statewide idling law listed in the US DOE Alternative Fuels Data Center compilation (checked Oct 2026)

Local rules may apply.

US DOE Alternative Fuels Data Center, MS laws list. Official source. Checked Oct 24, 2026.

Truck speed limit Verified

75 mph on rural interstates, 60 urban. No truck clause.

RSMo 304.010. Official source. Checked Oct 24, 2026.

Chain and traction law Unverified

Not yet confirmed from official text. Check the state source before you rely on it.

No official source linked yet. Checked Oct 24, 2026.

Idling limit No state law found

No statewide idling law listed in the US DOE Alternative Fuels Data Center compilation (checked Oct 2026)

Local rules may apply.

US DOE Alternative Fuels Data Center, MO laws list. Official source. Checked Oct 24, 2026.

Truck speed limit Verified Separate truck limit

Trucks over 1 ton rated capacity: 70 mph on interstates and 65 on other highways (cars 80 and 70).

MCA 61-8-312. Official source. Checked Oct 24, 2026.

Chain and traction law Verified

MDT may require chains or traction devices when posted. From Oct 1 to Apr 30, trucks of 26,001 lb or more towing trailers must carry traction devices in designated areas.

MCA 61-9-406, 61-9-436. Official source. Checked Oct 24, 2026.

Idling limit No state law found

No statewide idling law listed in the US DOE Alternative Fuels Data Center compilation (checked Oct 2026)

Local rules may apply.

US DOE Alternative Fuels Data Center, MT laws list. Official source. Checked Oct 24, 2026.

Truck speed limit Verified

75 mph on interstates; 70 on other state freeways; 65 on other state highways. No truck clause.

Seventy-five miles per hour upon the National System of Interstate and Defense Highways

Neb. Rev. Stat. 60-6,186. Official source. Checked Oct 24, 2026.

Chain and traction law No state law found

No chain law found. State law permits tire chains of reasonable proportions when needed for snow or ice but does not require them.

It shall be permissible to use tire chains of reasonable proportions upon any vehicle when required for safety because of snow, ice, or other condition tending to cause a vehicle to slide or skid.

Neb. Rev. Stat. 60-6,250. Official source. Checked Oct 24, 2026.

Idling limit No state law found

No statewide idling law listed in the US DOE Alternative Fuels Data Center compilation (checked Oct 2026)

Local rules may apply.

US DOE Alternative Fuels Data Center, NE laws list. Official source. Checked Oct 24, 2026.

Truck speed limit Verified Truck limit unverified

NDOT may set limits up to 80 mph on its highways and may set lower limits for trucks, oversize vehicles, trailers and buses. No fixed statutory truck limit.

may establish a speed limit on such highways not to exceed 80 miles per hour and may establish a lower speed limit: ... (b) For trucks, overweight and oversized vehicles, trailers drawn by motor vehicles and buses.

NRS 484B.613. Official source. Checked Oct 24, 2026.

Chain and traction law Verified

When posted, vehicles over 10,000 lb GVW must use tire chains.

NRS 484D.520; NAC 484D.235. Official source. Checked Oct 24, 2026.

Idling limit Verified

Diesel trucks and buses: no more than 15 consecutive minutes.

a person shall not idle the engine of a diesel truck or a bus for more than 15 consecutive minutes.

NAC 445B.576. Official source. Checked Oct 24, 2026.

Truck speed limit Verified

65 mph on the interstate system and named turnpikes (4-lane divided); 55 elsewhere. No truck clause.

RSA 265:60. Official source. Checked Oct 24, 2026.

Chain and traction law Unverified

Not yet confirmed from official text. Check the state source before you rely on it.

No official source linked yet. Checked Oct 24, 2026.

Idling limit Verified

Above 32 F, 5 minutes in any 60; 15 minutes between -10 F and 32 F; no limit below -10 F.

Env-A 1102.02. Official source. Checked Oct 24, 2026.

Truck speed limit Verified

50 mph default; 65 mph only on highways designated under the 65 MPH program. No truck clause found.

N.J.S.A. 39:4-98, 39:4-98.5 (NJDOT designated list). Official source. Checked Oct 24, 2026.

Chain and traction law Unverified

Not yet confirmed from official text. Check the state source before you rely on it.

No official source linked yet. Checked Oct 24, 2026.

Idling limit Verified

Diesel vehicles: no more than 3 consecutive minutes when stopped, with exemptions.

N.J.A.C. 7:27-14.3. Official source. Checked Oct 24, 2026.

Truck speed limit Verified

75 mph on rural interstates, 55 on public highways and 30 in business or residential areas, unless posted. The manual lists no separate truck limit.

75 mph on rural interstate highways, unless, posted otherwise

NM MVD Driver Manual (NMSA 66-7-301). Official source. Checked Oct 24, 2026.

Chain and traction law Unverified

Not yet confirmed from official text. Check the state source before you rely on it.

No official source linked yet. Checked Oct 24, 2026.

Idling limit No state law found

No statewide idling law listed in the US DOE Alternative Fuels Data Center compilation (checked Oct 2026)

Local rules may apply.

US DOE Alternative Fuels Data Center, NM laws list. Official source. Checked Oct 24, 2026.

Truck speed limit Verified

55 mph statutory maximum; NYSDOT and the Thruway Authority may set 65 mph on listed roads. Speed limits must apply to all vehicles alike, except lower limits for vehicles under special weight or size permits.

Authority to enact differential speed limits, applicable only to trucks, buses or specific classes or types of vehicles does not exist in the Vehicle and Traffic Law.

N.Y. VTL 1180, 1180-a (NYSDOT TSMI-17-05). Official source. Checked Oct 24, 2026.

Chain and traction law Unverified

Not yet confirmed from official text. Check the state source before you rely on it.

No official source linked yet. Checked Oct 24, 2026.

Idling limit Verified

On-road heavy-duty vehicles over 8,500 lb GVWR, diesel or not: no more than 5 minutes at a time, with exemptions (for example stuck in traffic, or below 25 F after 2 hours motionless).

from idling for more than five minutes at a time

6 NYCRR 217-3. Official source. Checked Oct 24, 2026.

Truck speed limit Verified

55 mph outside cities for all vehicles; posted limits may not exceed 70. No truck clause.

A speed limit set pursuant to this subsection may not exceed 70 miles per hour.

N.C.G.S. 20-141. Official source. Checked Oct 24, 2026.

Chain and traction law No state law found

No chain law found. State law permits tire chains of reasonable proportions when needed for snow or ice but does not require them.

it shall be permissible to use tire chains of reasonable proportions upon any vehicle when required for safety because of snow, ice or other conditions tending to cause a vehicle to slide or skid

N.C.G.S. 20-122. Official source. Checked Oct 24, 2026.

Idling limit No state law found

No statewide idling law listed in the US DOE Alternative Fuels Data Center compilation (checked Oct 2026)

Local rules may apply.

US DOE Alternative Fuels Data Center, NC laws list. Official source. Checked Oct 24, 2026.

Truck speed limit Verified

80 mph on access-controlled divided interstates; 70 on divided multilane highways. The director may set differing limits by vehicle type, but the Highway Patrol states there are no differential speed limits.

There are no differential speed limits in North Dakota, posted limits are the limits for all vehicles.

N.D.C.C. 39-09-02, 39-09-04; NDHP Commercial Vehicle Regulations (2026). Official source. Checked Oct 24, 2026.

Chain and traction law No state law found

No chain law found. State law permits tire chains of reasonable proportions but does not require them.

it is permissible to use tire chains of reasonable proportions

N.D.C.C. 39-21-40. Official source. Checked Oct 24, 2026.

Idling limit No state law found

No statewide idling law listed in the US DOE Alternative Fuels Data Center compilation (checked Oct 2026)

Local rules may apply.

US DOE Alternative Fuels Data Center, ND laws list. Official source. Checked Oct 24, 2026.

Truck speed limit Verified

70 mph on all rural freeways; 65 on urban freeways. No truck clause.

(14) Seventy miles per hour on all rural freeways;

R.C. 4511.21(B). Official source. Checked Oct 24, 2026.

Chain and traction law No state law found

No chain law found. State law allows tire chains when snow or ice is on the road but does not require them.

This section does not apply to the use of tire chains when there is snow or ice on the streets or highways where such chains are being used

R.C. 5589.081(C). Official source. Checked Oct 24, 2026.

Idling limit No state law found

No statewide idling law listed in the US DOE Alternative Fuels Data Center compilation (checked Oct 2026)

Local rules may apply.

US DOE Alternative Fuels Data Center, OH laws list. Official source. Checked Oct 24, 2026.

Truck speed limit Verified Truck limit unverified

The Transportation Commission sets maximum speeds on controlled-access highways (up to 75 mph on rural interstates after a study). The Turnpike Authority may set separate limits for trucks, up to 80 mph on turnpikes. County roads 55 unless posted.

The Oklahoma Turnpike Authority is hereby authorized to prescribe maximum and minimum speeds for trucks, buses and automobiles using turnpikes

47 O.S. 11-801. Official source. Checked Oct 24, 2026.

Chain and traction law Verified

No chain requirement. The statute allows tire chains when needed for snow or ice, but limits that exception to vehicles rated up to 2 tons and to November 1 through April 1.

the use of such tires or tire chains shall be limited to vehicles with rated capacities up to and including two (2) tons

47 O.S. 12-405. Official source. Checked Oct 24, 2026.

Idling limit No state law found

No statewide idling law listed in the US DOE Alternative Fuels Data Center compilation (checked Oct 2026)

Local rules may apply.

US DOE Alternative Fuels Data Center, OK laws list. Official source. Checked Oct 24, 2026.

Truck speed limit Verified Separate truck limit

Trucks over 10,000 lb GVWR and truck tractors are limited to 55 mph except on segments listed in ORS 811.111(2)-(12) or as posted; interstates default to 65 for other vehicles.

ORS 811.111(1)(b). Official source. Checked Oct 24, 2026.

Chain and traction law Verified

Traction tires or chains are required where signs are posted. Commercial vehicles over 10,000 GVW must carry chains when Snow Zone signs are posted.

ORS 815.140; OAR 734-017. Official source. Checked Oct 24, 2026.

Idling limit Verified

Commercial vehicles: no more than 5 minutes in any 60-minute period, with exemptions.

Allows the engine of the commercial vehicle to idle for more than five minutes in any continuous 60-minute period.

ORS 825.605 to 825.610. Official source. Checked Oct 24, 2026.

Truck speed limit Verified

65 or 70 mph for all vehicles on freeways where posted; 55 otherwise.

65 miles per hour or 70 miles per hour for all vehicles on freeways where the department has posted

75 Pa.C.S. 3362. Official source. Checked Oct 24, 2026.

Chain and traction law Verified

During winter weather events PennDOT can impose tiered restrictions on commercial vehicles. In Tier 2, loaded tandem trailers need chains or an approved alternate traction device on board; in Tier 3 the only commercial vehicles allowed are loaded single trailers with chains or approved devices.

no commercial vehicles are permitted EXCEPT loaded single trailers with chains or approved Alternate Traction Devices

PennDOT Winter Event Vehicle Restrictions (75 Pa.C.S. 4525). Official source. Checked Oct 24, 2026.

Idling limit Verified

Diesel vehicles of 10,001 lb or more: no more than 5 minutes in any 60-minute period.

35 P.S. 4601-4608 (Act 124 of 2008). Official source. Checked Oct 24, 2026.

Truck speed limit Verified

Prima facie 50 mph by day and 45 by night outside business and residence districts; the state traffic commission may set other limits by posting (31-14-4). No truck clause in 31-14-2.

(2) Fifty miles per hour (50 mph) in other locations during the daytime;

R.I. Gen. Laws 31-14-2. Official source. Checked Oct 24, 2026.

Chain and traction law Unverified

Not yet confirmed from official text. Check the state source before you rely on it.

No official source linked yet. Checked Oct 24, 2026.

Idling limit Verified

Diesel vehicles: no more than 5 consecutive minutes in any 60-minute period, with DEM exemptions.

in excess of five (5) consecutive minutes in any sixty (60) minute period

R.I. Gen. Laws 31-16.1-3. Official source. Checked Oct 24, 2026.

Truck speed limit Verified

70 mph on interstates and freeways where posted. No truck clause.

seventy miles an hour on the interstate highway system and other freeways where official signs giving notice of this speed are posted

S.C. Code 56-5-1520. Official source. Checked Oct 24, 2026.

Chain and traction law No state law found

No chain law found. State law permits tire chains of reasonable proportions when needed for snow or ice but does not require them.

it shall be permissible to use tire chains of reasonable proportions upon any vehicle when required for safety, because of snow, ice or other conditions tending to cause a vehicle to skid

S.C. Code 56-5-5040. Official source. Checked Oct 24, 2026.

Idling limit Verified

Commercial diesel vehicles: no more than 10 minutes in any 60-minute period.

An operator of a commercial diesel vehicle may not allow the vehicle to idle for more than ten minutes in any sixty-minute period.

S.C. Code 56-35-20. Official source. Checked Oct 24, 2026.

Truck speed limit Verified

80 mph on interstates for any vehicle. The Transportation Commission may set limits by rule for vehicles over 10,000 lb or any class of vehicle; the current speed rules contain no statewide truck limit, only local zones such as a 25 mph truck limit on 2.5 miles of northbound US 385 near Pluma.

no person may drive a vehicle upon the national system of interstate highways at a speed in excess of eighty miles per hour

SDCL 32-25-4, 32-25-6, 32-25-7; ARSD 70:01:02. Official source. Checked Oct 24, 2026.

Chain and traction law Verified

The Secretary of Transportation may restrict state trunk highways to four-wheel-drive vehicles or vehicles with tire chains, studded snow tires or adequate snow tires. Signs announce the restriction; violation is a misdemeanor.

the secretary of transportation may restrict public travel upon the state trunk highway system to four - wheel drive vehicles or motor vehicles equipped with tire chains

SDCL 32-19-3.1. Official source. Checked Oct 24, 2026.

Idling limit No state law found

No statewide idling law listed in the US DOE Alternative Fuels Data Center compilation (checked Oct 2026)

Local rules may apply.

US DOE Alternative Fuels Data Center, SD laws list. Official source. Checked Oct 24, 2026.

Truck speed limit Verified Truck limit unverified

Statutory maximum 70 mph on interstates and 65 on other public roads. TDOT may post a lower truck limit, no more than 10 mph below the limit for other vehicles.

If a lower truck limit is used, it shall not be more than 10 mph lower than the posted speed limit for other vehicles.

TDOT Traffic Operations Memorandum 1801 (Tenn. Code 55-8-152). Official source. Checked Oct 24, 2026.

Chain and traction law Unverified

Not yet confirmed from official text. Check the state source before you rely on it.

No official source linked yet. Checked Oct 24, 2026.

Idling limit No state law found

No statewide idling law listed in the US DOE Alternative Fuels Data Center compilation (checked Oct 2026)

Local rules may apply.

US DOE Alternative Fuels Data Center, TN laws list. Official source. Checked Oct 24, 2026.

Truck speed limit Verified

70 mph prima facie on numbered highways outside urban districts; the commission may set up to 75 (80 or 85 on listed roads). Light trucks and buses use car limits, and day and night limits must match. No truck differential.

An entity that establishes or alters a speed limit under this subchapter shall establish the same speed limit for daytime and nighttime.

Tex. Transp. Code 545.352, 545.353. Official source. Checked Oct 24, 2026.

Chain and traction law Unverified

Not yet confirmed from official text. Check the state source before you rely on it.

No official source linked yet. Checked Oct 24, 2026.

Idling limit Verified

Only where local governments signed a TCEQ agreement: vehicles over 14,000 lb GVWR, no more than 5 consecutive minutes.

30 TAC 114.510-114.517. Official source. Checked Oct 24, 2026.

Truck speed limit Verified Truck limit unverified

55 mph default outside urban districts; posted limits up to 65, or 75 on freeways and limited access highways (higher where UDOT studies allow). UDOT may set different limits by time of day or type of vehicle.

The Department of Transportation may establish different speed limits on a highway or section of highway based on: (a) time of day; ... (c) type of vehicle

Utah Code 41-6a-601, 41-6a-602. Official source. Checked Oct 24, 2026.

Chain and traction law Verified

UDOT may require traction devices when conditions warrant; vehicles over 12,000 GVW need devices on all drive tires.

Utah Code 41-6a-1636; Utah Admin. Code R920-6. Official source. Checked Oct 24, 2026.

Idling limit No state law found

No statewide idling law listed in the US DOE Alternative Fuels Data Center compilation (checked Oct 2026)

Local rules may apply.

US DOE Alternative Fuels Data Center, UT laws list. Official source. Checked Oct 24, 2026.

Truck speed limit Verified Truck limit unverified

50 mph maximum unless the Traffic Committee sets other limits by posting; it may set different limits for different types of vehicles (23 V.S.A. 1003).

a vehicle on a highway at a speed in excess of 50 miles per hour.

23 V.S.A. 1081(b), 1003. Official source. Checked Oct 24, 2026.

Chain and traction law Verified

State officials may require tire chains on posted sections of state highways in winter for vehicles over 26,000 lb GVWR or GCWR. When signs are posted, chains must be on the drive tires as the statute lists.

may require the use of tire chains on specified portions of State highways during periods of winter weather for vehicles with a gross vehicle weight rating (GVWR) of more than 26,000 pounds

23 V.S.A. 1006c. Official source. Checked Oct 24, 2026.

Idling limit Verified

No more than 5 minutes in any 60-minute period while stationary, with exemptions.

A person shall not cause or permit operation of the primary propulsion engine of a motor vehicle for more than five minutes in any 60-minute period while the vehicle is stationary.

23 V.S.A. 1110. Official source. Checked Oct 24, 2026.

Truck speed limit Verified Separate truck limit

Trucks, tractor trucks and combinations are limited to 45 mph on highways other than interstates, limited access, 4-lane and primary highways (cars 55). Interstates 55, or 70 where posted.

but 45 miles per hour on such highways if the vehicle is a truck, tractor truck, or combination of vehicles designed to transport property

Va. Code 46.2-870. Official source. Checked Oct 24, 2026.

Chain and traction law No state law found

No chain law found. State law permits tire chains of reasonable proportions when needed for snow or ice but does not require them.

to use tire chains of reasonable proportions when required for safety because of snow, ice, or other conditions tending to cause a vehicle to slide or skid

Va. Code 46.2-1044. Official source. Checked Oct 24, 2026.

Idling limit Verified

In commercial or residential urban areas, commercial vehicles: 3 minutes when parked; diesel vehicles up to 10 minutes.

Diesel powered vehicles may idle for up to 10 minutes to minimize restart problems.

9VAC5-40-5670(C). Official source. Checked Oct 24, 2026.

Truck speed limit Verified Separate truck limit

Vehicles over 10,000 lb gross weight and combinations are limited to 60 mph.

RCW 46.61.410(2). Official source. Checked Oct 24, 2026.

Chain and traction law Verified

Nov 1 to Apr 1, vehicles over 10,000 lb GVWR must carry chains on listed routes (I-90, I-82 and named passes) and use them when posted.

RCW 46.37.420; WAC 204-24. Official source. Checked Oct 24, 2026.

Idling limit No state law found

No statewide idling law listed in the US DOE Alternative Fuels Data Center compilation (checked Oct 2026)

Local rules may apply.

US DOE Alternative Fuels Data Center, WA laws list. Official source. Checked Oct 24, 2026.

Truck speed limit Verified

Limits on controlled-access and interstate highways may not be set below 55 mph; no truck clause.

W. Va. Code 17C-6-1. Official source. Checked Oct 24, 2026.

Chain and traction law No state law found

No chain law found. State law permits tire chains of reasonable proportions when needed for snow or ice but does not require them.

it shall be permissible to use tire chains of reasonable proportions upon any vehicle when required for safety because of snow, ice, or other conditions tending to cause a vehicle to skid

W. Va. Code 17C-15-37. Official source. Checked Oct 24, 2026.

Idling limit Verified

Commercial vehicles over 10,000 lb: no more than 15 minutes in any 60-minute period.

idle for more than fifteen minutes in any continuous sixty-minute period

W. Va. Code 17C-13A-2. Official source. Checked Oct 24, 2026.

Truck speed limit Verified

70 mph on freeways, 65 on expressways. No truck clause.

Wis. Stat. 346.57. Official source. Checked Oct 24, 2026.

Chain and traction law No state law found

No chain law found. State law permits tire chains of reasonable proportions when needed for snow or ice but does not require them.

Tire chains of reasonable proportions may be used on any vehicle when required for safety because of snow, ice or other conditions tending to cause a vehicle to skid.

Wis. Stat. 347.45(2)(b). Official source. Checked Oct 24, 2026.

Idling limit No state law found

No statewide idling law listed in the US DOE Alternative Fuels Data Center compilation (checked Oct 2026)

Local rules may apply.

US DOE Alternative Fuels Data Center, WI laws list. Official source. Checked Oct 24, 2026.

Truck speed limit Verified

75 mph on interstates (up to 80 where designated), 70 on non-interstate state highways, 65 on other paved roads, 55 on unpaved roads. Commercial vehicles follow the same limits. WYDOT may post limits by vehicle type only in localized areas.

The operator of a commercial vehicle shall comply with the speed limits as established pursuant to W.S. 31-5-301

W.S. 31-5-301, 31-5-302, 31-18-604. Official source. Checked Oct 24, 2026.

Chain and traction law Verified

WYDOT may restrict travel in snow and ice. At Level 2 commercial vehicles must chain two drive wheels. Fines up to $250, or $750 if a closure results.

W.S. 31-5-956. Official source. Checked Oct 24, 2026.

Idling limit No state law found

No statewide idling law listed in the US DOE Alternative Fuels Data Center compilation (checked Oct 2026)

Local rules may apply.

US DOE Alternative Fuels Data Center, WY laws list. Official source. Checked Oct 24, 2026.