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Truck Speed Limit No. IL Split limit

Illinois Truck Speed Limit

Statewide, trucks run the same 70 as cars on rural interstates. The catch is the Chicago collar. In Cook, DuPage, Kane, Lake, McHenry, and Will counties, any truck over 8,000 lb is capped at 60 on the interstate and 55 on every other road (625 ILCS 5/11-601). Everywhere else there is no split. And Illinois will charge you: 26 to 34 over is a Class B misdemeanor, 35+ is a Class A misdemeanor (625 ILCS 5/11-601.5).

Rural interstate70 mph statewide, but 60 mph in the 6 Chicago collar counties
Split from carsYes
Other divided roads55 mph on non-interstate roads in the 6 collar counties; matches cars elsewhere
Statute625 ILCS 5/11-601(e)
01 The limit

How fast a truck can run in Illinois

Statewide, trucks run the same 70 as cars on rural interstates. The catch is the Chicago collar. In Cook, DuPage, Kane, Lake, McHenry, and Will counties, any truck over 8,000 lb is capped at 60 on the interstate and 55 on every other road (625 ILCS 5/11-601). Everywhere else there is no split. And Illinois will charge you: 26 to 34 over is a Class B misdemeanor, 35+ is a Class A misdemeanor (625 ILCS 5/11-601.5).

02 Watch for

Truck-specific rules and quirks

03 Penalties

What a speeding ticket costs

Illinois criminalizes big overages: 26 to 34 mph over the limit is a Class B misdemeanor (up to 6 months, $1,500), and 35+ over is a Class A misdemeanor (up to a year, $2,500) under 625 ILCS 5/11-601.5. You get one shot at court supervision for aggravated speeding, ever.

Illinois Truck Speed Limit FAQ

What is the truck speed limit in Illinois?
70 mph statewide, but 60 mph in the 6 Chicago collar counties on rural interstates, 55 mph on non-interstate roads in the 6 collar counties; matches cars elsewhere on other divided highways. Illinois splits the limit: trucks run below cars. See 625 ILCS 5/11-601(e).
Do trucks have a lower speed limit than cars in Illinois?
Yes. 10 mph lower than cars (60 vs 70), but only in the 6 Chicago collar counties; matches cars everywhere else. The 60/55 truck cap applies to any second-division vehicle over 8,000 lb GVW in Cook, DuPage, Kane, Lake, McHenry, and Will counties (625 ILCS 5/11-601(e)). Madison and St. Clair may opt in by ordinance. Outside those counties trucks run the same 70 as cars.
What is the speeding penalty for a truck in Illinois?
Illinois criminalizes big overages: 26 to 34 mph over the limit is a Class B misdemeanor (up to 6 months, $1,500), and 35+ over is a Class A misdemeanor (up to a year, $2,500) under 625 ILCS 5/11-601.5. You get one shot at court supervision for aggravated speeding, ever.

Reference information for planning, not legal advice. Traffic laws change and this can be out of date, so always confirm the current statute and obey posted signs before you rely on it. Last reviewed July 2026. Source: https://www.ilga.gov/Documents/legislation/ilcs/documents/062500050K11-601.htm. See our Terms & Disclaimer.

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