Illinois Truck Idling Law
Illinois has a statewide diesel idling limit, but it only applies in counties that fail federal air standards (Cook, the collar counties, and the Metro East counties near St. Louis). There, a diesel truck over 8,000 pounds may not idle more than 10 minutes per hour, with up to 30 minutes to weigh, load, or unload (625 ILCS 5/11-1429). It is waived below 32F or above 80F, and an APU is fine. Chicago is stricter at 3 minutes per hour with a $250 fine.
When you can keep idling
- Traffic
- Mechanical work
- Sleeper-berth rest
- Below 32F or above 80F
- PTO and accessory power
APUs and idle-reduction gear
The statute lets you run an APU or gen-set instead of the main engine.
City and county ordinances
- Chicago: 3 minutes per hour, $250 (Municipal Code 9-80-095).
Illinois Idling Law FAQ
Is there a truck idling law in Illinois?
How long can a truck idle in Illinois?
What is the fine for idling in Illinois?
Does an APU count as idling in Illinois?
This page is reference information for planning, not legal advice. Idling rules change and many are local. Confirm the current rule with the state environmental or transportation agency before you rely on it. Source: https://afdc.energy.gov/fuels/laws/IR?state=IL.
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