Illinois 5 Axle Semi Truck Size and Weight Limits

Illinois: 5 Axle Semi Truck

semi truck tractor trailer

Gross Weight Limits

Ruleset Jurisdication Permit Required? Estimated Gross *
US Federal Class I and II Highways No 80,000 lbs

* This is an estimate as it does not include bridge and tire compliance.

Axle Weight Limits

Ruleset: US Federal

Jurisdication: Class I and II Highways

Axle Group Tire Type Axle Spread Axle Weight Limit
Steer AxleSingle 20,000 lbs
Tandem DrivesDuals40 - 96 in 34,000 lbs
Trailer TandemDuals40 - 96 in 34,000 lbs
Trailer TandemDuals96 - 108 in 38,000 lbs
Trailer TandemDuals108 - 120 in 39,000 lbs
Trailer TandemDuals120 - 121 in 40,000 lbs

Dimension Restrictions

Class I and II HighwaysNon-State Highways
Dimension NameMinMaxMinMax
Overall Height13' 6"
Overall LengthNo Limit55' 0"
Overall Width8' 6"
Front OverhangNone Specified - Auto Carriers 3'
Rear Overhang4' 0" Max - Only applies to auto and boat carriers
Semi-Trailer Length53' 0"
Semi-Trailer Wheelbase
- Kingpin to Center of Rear Axle
45' 6"



These figures are interpreted from the legal codes freely available, please read our full disclaimer and inform us of any errors!