Truck Speed Limit Regulations by State

Why do state laws vary?

Commercial truck crossing bridge
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Alan Thornton / Getty Images 

In the United States, each state or jurisdiction sets its own speed limit regulations for cars and trucks. While each is different, truck speed limits are often lower than that of passenger vehicles.

These specific speed limits are usually only applicable to large commercial motor vehicles (CMVs) such as trailers, buses, and heavy trucks. They can vary depending on whether the area is rural or densely populated, as well as whether it's day or night driving.

Truck Speed Limit Laws: The Complete List

Highway speed limits can range from 50 mph (80 km/h) in urban areas to 80 mph (128 km/h) in rural areas. Typically posted in increments of 5 miles per hour (mph), truck speed limits are set by either the state or the local counties, municipalities, or other local statutes. Many jurisdictions have speed limits that are lower for trucks (not light trucks or large passenger vehicles referred to as trucks). 

Be sure to check all posted speed limits and drive according to the conditions of the road. The information listed below is only general information and is only meant to be used as a reference. It should not be considered the legal authority. 

State Rural Interstates Urban Interstates Other Limited Access Roads
Alabama 70 65 65
Alaska 65 55 65
Arizona 75 65 65
Arkansas 70 65 70
California 55 55 55
Colorado 75 65 65
Connecticut 65 55 65
Delaware 65 55 65
D.C. N/A 55 N/A
Florida 70 65 70
Georgia 70 70 65
Guam N/A* N/A* N/A*
Hawaii 60 60 55
Idaho 70 65 70
Illinois 70 55 65
Indiana 65 55 60
Iowa 70 55 70
Kansas 75 75 75
Kentucky 65 65 65
Louisiana 75 70 70
Maine 75 75 75
Maryland 70 70 70
Massachusetts 65 65 65
Michigan 65 70 70
Minnesota 70 65 65
Mississippi 70 70 70
Missouri 70 60 70
Montana 70 65 70 Day / 65 Night
Nebraska 75 70 70
Nevada 80 65 70
New Hampshire 65 or 70 65 55
New Jersey 65 55 65
New Mexico 75 75 65
New York 65 65 65
North Carolina 70 70 70
North Dakota 75 75 70
N.M. Islands None 25 None
Ohio 70 65 70
Oklahoma 75 70 70
Oregon 55 or 65 55 65
Pennsylvania 70 70 70
Rhode Island 65 55 55
South Carolina 70 70 60
South Dakota 80 80 70
Tennessee 70 70 70
Texas 75 75 75
Utah 75 65 75
Vermont 65 55 50
Virgin Islands 40 55 20
Virginia 70 70 65
Washington 60 60 60
West Virginia 70 55 65
Wisconsin 70 70 70
Wyoming 75 75 70
Truck Speed Limit, in miles per hour (mph)***

Why Do State Laws Vary?

Traditionally, states are responsible for setting speed limits. However, in the mid-1970s Congress withheld funds from states that had speed limits higher than 55 mph by passing the National Maximum Speed Law. It was done for a couple of reasons:

  • Fuel economy: As a response to the 1973 oil crisis, it was considered a gas saver because cars were thought to run more efficiently and use less gas at a speed of 55 mph. This effect on fuel efficiency has been heavily debated.
  • Safety increase: The effect on safety is unclear as studies and opinions of safety advocates are mixed when it comes to speed limits for trucks.

At the time, motorists widely disregarded the law. In 1987, the requirements were changed for rural interstates and then completely repealed by 1995. Speed limit choices were again up to the states, and in 2019, 41 states have some portions of the roadway system with speed limits of 70 mph or higher.

In rare instances, such as for West Virginia, speed limits are not set by law, but by the Commissioner of the Division of Highways. In Rhode Island, speed limits are not set by law, but by the state traffic commission. The State Highway Safety Offices in each state can supply up-to-date information on individual state speed limits and transportation laws.

*Guam does not have any Interstates. The maximum truck speed limit is 35 in rural areas, 15 in residential areas, 15 or 25 in school zones.

***Table data was compiled from the Insurance Institute for Highway Safety (IIHS).