Maximum width on interstates, highways, roads. Commercial or private.

What is the maximum width on highways, roads and interstates?

What is the maximum width allowed on Interstates and highways (all reasonable access roads or what is referred to as the “National Network” or “NN”)? The maximum width allowed on Interstates and highways in North America is (unless otherwise posted by sign):

Standard:
8 feet and 6 inches or 102.36 inches.

Metric:
2.6 meters or 260 centimeters.

Exceptions:
Within the state of Hawaii commercial motor vehicles are permitted the following maximum width on all highways (unless otherwise posted by sign):

Standard:
9 feet or 108 inches.

Metric:
2.74 meters or 274 centimeters.

Notes: These rules are for personal, commercial motor vehicles including semi tractors, trailers and buses. Mirrors and other items such as “mirrors” or “certain safety devices” (such as flags, etc.) are not included and may protrude out within a reasonable distance further. It should also be noted that there are county roads that do not support the maximum widths governed by federal guidelines. These roads usually have signs posted that display the maximum legal width permitted with out obtaining a special travel permit. You should always inquire about the maximum widths permitted by the governing body of the particular road prior to travelling on it in order to prevent a fine or worse. In some situations depending on the width of the vehicle or shipment size a route survey will be required prior to being granted permission to travel.

Maximum width allowed.

Maximum width laws are created to protect motorists and public assets. Know the maximums.

The importance of setting maximum widths for vehicles.

Safety of motorists and public property are the main reasons regulations were set for vehicle width maximums. A standard was required based on the dimensions of the existing roads that would protect any/all persons operating a motor vehicle on highways, roads and interstates. It should also be noted public property is placed at risk for damage as well. Should a motorists accidentally hit one of the many existing obstructions such as guard rails, signs, traffic signal poles, etc. liability while ultimately is the motorists, if it is not reported the state is required to repair damages which then is passed on to the taxpayers in both the USA and Canada. So maximum widths were created to protect both human lives but public property as well.

Maximum width allowed

Maximum vehicle width permitted on highways. Image credit FHWA.

Noteworthy information:

“Federal width limits do not apply to special mobile equipment, which consists of self-propelled vehicles not designed or used primarily for the transportation of persons or property and only incidentally moved over the highways. Special mobile equipment includes the following, when moving under their own power: military or farm equipment; instruments of husbandry; road construction or maintenance machinery; and emergency apparatus, including police and fire emergency equipment. Federal rules do not require States to issue overwidth permits before allowing operation of special mobile equipment. However, if States wish to allow other vehicles more than 102 inches wide (i.e. non-special mobile equipment) to operate on the NN, then States must issue special overwidth permits.” Reference credit: FHWA website.

History:

“The Federal Government first enacted size regulations for CMVs with the passage of the Federal-Aid Highway Act of 1956. This Act provided a maximum vehicle width of 96 inches (2.44 meters) on the Interstate highway system. Subsequently, the Federal-Aid Highway Act of 1976 increased the allowable width for buses to 102 inches (2.6 meters). The Surface Transportation Assistance Act (STAA) of 1982 extended the same width requirement of 102 inches to commercial trucks. At the same time, the STAA expanded the highway network on which the Federal width provision applied from the Interstate to the National Network (NN) of highways.” Reference credit: FHWA website.

 

Related links:

See regulations for maximum load limitations.
Learn what a route survey is.
Maximum length allowed on roads, highways and interstates.
Maximum legal load sizes.
Multi state and regional permits.

 

 

Road conditions and weather report for all US states – click here.

Road conditions and weather report for all US states - click here.

United States road conditions including interstate and highway. Weather conditions.

Road conditions and highway weather map.

Map provided by courtesy of www.fhwa.dot.gov

 

 

 

 

 

 

We also feature just road closure information for truck drivers.

 

Alabama 334-242-4378 or 888-411-7623

(Road conditions, weather and advisory information)

Alaska 907-428-7200 road condition info. 907-273-6037 #2 road construction info.
(Latest weight restrictions, route summary reports)

Arkansas 501-569-2374 for road conditions. 501-569-2227 road construction info – weekdays.
(Weather related road conditions/closings with interactive map option)

Arizona 888-411-7623 or dial within the state 511.
(Traffic, closure, constuction, delays and conditions information map.)

California 916-445-7623 or 800-427-7623 for highway conditions.
(Real time clickable traffic, road and conditions info map)

Colorado 511 in state or 303-573-7623 for highway conditions report.
(Real time clickable traffic, speeds, conditions and construction info map)

Connecticut 860-594-2000 #8
(Road conditions with cams and incident information.)

Delaware 302-760-2080 Live operator during normal business hours.
(Road conditions interactive map with travel alerts)

Florida Road Conditions- or dial 511 within the state. 800-292-3368
Southwest Florida only 800-749-2967
Lake City 800-207-8236
Jacksonville 800-780-7102
District 5 800-435-2368
District 6 800-226-7220
District 7 800-749-7453
Florida Turnpike 800-475-0044
(Road construction and incidents mp) 

Georgia Dial *DOT- if you are in the state. 404-635-6800 road conditions 24/7 404-635-8900 road construction.
(Road conditions, construction, closures and weather.)

Idaho 888-432-7623-511 info Interstate, highway and road conditions.
(Road weather conditions and construction map)

Iowa 515-288-1047 Interstate, highway and road conditions.
(Iowa travel information and highway traffic reports)

Illinois 800-452-4368
(Winter road conditions as well as traffic reports)

Indiana 800-261-7623 Interstate, highway and road conditions.
317-232-8298 State Police (12-1 to 3-31 for winter months only)
(Road and weather information)

Kansas 800-585-7623 Interstate, highway and road conditions.
(Road conditions and travel information)

Kentucky 866-737-3767 #2 Interstate, highway and road conditions.
(Road conditions and information links)

Maine 866-282-7578 Interstate, highway and road conditions.
(Road conditions map)

Massachusetts (617)374-1234 Interstate, highway and road conditions.
(Road construction and traffic reports)

Maryland
(Maps for road conditions and current route restrictions)

Michigan 800-381-8477 Interstate, highway and road conditions.
(Construction, incident alerts and road closures)

Minnesota 800-542-0220 Interstate, highway and road conditions.
(Traveler information)

Missouri
(Road conditions, closed road and construction map)

Mississippi 601-987-1212 #1 Interstate, highway and road conditions.
(Road conditions and traveler information)

Montana 800-226-7623 Interstate, highway and road conditions.
(Road closures and conditions)

Nebraska 800-906-9069 Interstate, highway and road conditions. (from outside NE); 511 (from inside NE)
(Road closure and weather conditions map as well as construction delays)

Nevada 877-687-6237
(Road conditions and traveler information)

New Hampshire 866-282-7579 Interstate, highway and road conditions.  From outside NH or 511 from inside the state.
(Road conditions)

New Jersey
(Road conditions and alerts)

New Mexico 800-432-4269 Interstate, highway and road conditions.
(Road conditions map)

New York 800-847-8929 #2 for road conditions or #3 for construction info.
Road conditions and information map)

North Carolina 877-511-4662  Interstate, highway and road conditions.
(Road conditions and construction information map)

North Dakota 866-696-3511  Interstate, highway and road conditions.
(Road conditions and information map)

Ohio 888-264-7623 if in Ohio State. 614-466-7170 #5 if outside of State.
Road conditions and construction information map)

Oklahoma 405-425-2385 or 888-425-2385 Interstate, highway and road conditions.
(Road conditions information map)

Oregon 800-977-6368 or 503-588-2941 Interstate, highway and road conditions.
(Road conditions information map)

Pennsylvania 814-355-6044 Interstate conditions and construction. 717-939-9551 – extension 92.
Turnpike conditions and construction.
(Road conditions information map)

Rhode Island 888-401-4511 Interstate, highway and road conditions, construction and closures.
(Road conditions, construction and closure information map)

South Carolina 803-896-9621 Interstate highway and road closure, construction and conditions.
(Road conditions information map)

South Dakota 866-697-3511
(Road conditions, construction, closure information map)

Tennessee 800-342-3258 Interstate, highway and road conditions.
(Road conditions information map)

Texas 800-452-9292 Interstate, highway and road conditions.
(Road conditions information map)

Utah 866-511-8824 Interstate, highway and road conditions. from outside UT. Dial 511 within state.
(Road conditions information map)

Virginia 800-367-7623 Interstate, highway and road conditions.
(Road conditions information map)

Vermont 800-429-7623 Interstate, highway and road conditions.
(Road conditions information map)

Washington 800-695-7623 Interstate, highway and road conditions.
(Road conditions information map)

West Virginia 877-982-7623 Interstate, highway and road conditions.
Road conditions information map)

Wisconsin 414-785-7140 or toll free: 800-762-3947 Interstate, highway and road conditions.
(Road conditions information map)

Wyoming 307-772-0824 or toll free 888-996-7623 Interstate, highway and road conditions
(Road conditions information map)

 

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