The Ultimate Guide To Navigating Illinois Oversize/Overweight Permits: Everything Truckers Need To Know About IL DOT Permits, And More

June 10, 2024

As a trucking permit agency, IRP Trucks understands the importance of navigating the complexities of Oversize/Overweight permits in Illinois. In this comprehensive guide, we will provide a detailed overview of the requirements, restrictions, and regulations for obtaining and utilizing Illinois Oversize permits.

Improving My Knowledge of Illinois Oversize/Overweight Permits

When a vehicle’s dimensions or weight above the typical restrictions for the state’s roadways, the Illinois Department of Transportation (IDOT) issues an Oversize/Overweight permit. For a range of excessive loads, you may get these licenses, which are good for five days.

When Open and What You Cannot Do

Oversize/Overweight cargoes in Illinois have different operating times based on their dimensions. Permits are granted for continuous transit 24-hours a day, seven days a week for loads up to 12′ broad, 13′-6″ high, and 200′ long, with one civilian escort during the dark hours. Permits are valid for travel Monday through Friday from half an hour before dawn until half an hour after sunset, and on Saturdays from half an hour before sunrise until midday, for loads that do not exceed 14′-6″ broad, 15′ high, and 200′ in length. There are other limits, although loads larger than these dimensions may still travel during the same hours.

Travel Restrictions in Illinois

Expressways in Cook County are one of numerous Illinois restricted traffic zones; they have a weight restriction of 120,000 pounds and a width restriction of 12 feet. Also, in certain counties, cargoes wider than 14 feet, 6 inches may only be transported between the hours of 9:00 am and 3:00 pm, Monday through Friday at the latest. The day before a big holiday or holiday weekend, at noon, all travel is prohibited.

The Legal Aspects

Vehicles in the state of Illinois must adhere to the following dimensions:

– On approved roadways, the length is 53 feet for the semi-trailer and 65 feet for the whole vehicle. There is a 3-foot front overhang and a 4-foot rear overhang, with an extra 2-foot rear overhang permitted within the permissible length restrictions.
– Width: 8′-6″ on highways that have been officially designated, and 8′ on roads that have not.
13 feet, 6 inches tall.
– Weight: 80,000 lbs., with 20,000 lbs. allowed each axle, 34,000 lbs. per tandem, and 42,500 lbs. per tridem.

Illinois routine Oversize/Overweight load permits are subject to the following limitations:

– Length: 145′.
– Width: 14′-6″.
– Height: 15′ (depending on overhead clearances, with a 3″ clearance required).
– Weight: Single axle limits of 24,000 pounds, tandem axle limits of 48,000 pounds, and tridem axle limits of 60,000 pounds. Quad axle limits are up to 100,000 pounds with a superload permit.


When it comes to Illinois’s Oversize/Overweight permit regulations, there are a few loopholes. On weekdays, you don’t require a permit to carry structural items (beams, poles, pipe, culvert, etc.) that are 80 feet or shorter (total length 100 feet or less). Daytime, weekend, and over-width permit-free hauling of farm tractors and other husbandry tools is allowed. Anything beyond 13 feet, 6 inches in height or weight still requires a permit.


Oversize/Overweight load in Illinois need different numbers of escorts based on their dimensions:

–  Length: Over 110′ – one escort, over 145′ – three escorts, over 200′ – State Police.
– Width: Over 14′-6″ – one escort, over 16′ – three escorts, over 18′ – Illinois State Police escorts.
– Height: Over 14′-6″ – one escort with a high pole, over 16′ – route survey required and one escort, over 18′ – two escorts and State Police.

Several Regardless of

Illinois has a number of odd regulations regarding large loads:

– Lift Axles: Lift axles are not considered for routine issuance.
– Blades and Buckets: Blades, buckets, counterweights, and other attachments are allowed.
– Combination Loads: Combination loads cannot be permitted for two over dimensions on two different pieces (e.g., overwidth dozer and overheight backhoe on the same load).
– Signs, Flags, and Lights: Flags are required on the extremities of all Oversize/Overweight vehicles or loads and all protruding objects. “Oversize/Overweight Load” signs are required on loads over 10′ wide, 14′-6″ high, and/or 75′ long. All Oversize/Overweight/overweight permit loads must display an operable oscillating, rotating, or flashing amber light or lights on the tractor.

Last Thoughts

Understanding the criteria, limits, and rules may assist truckers manage the difficulties of Illinois’s Oversize/Overweight permits. This will guarantee a smooth and safe travel. For any and all of your Oversize/Overweight permit requirements, you can rely on the knowledgeable staff here at IRP Trucks. For additional information on how we may assist you with the Illinois Oversize/Overweight permit procedure, contact us now.


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