['Size and Weight Limits']
['Sizes and weights']
07/19/2024
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| Dimension | National Network | State and Other Supplemental Highways |
| Width: | 8' 6" | 8' 6" |
| Height: | 13' 6" | 13' 6" |
| Length: | National Network | State and Other Supplemental Highways Class III & Non-Designated |
| Bus | 42' 45' for a charter or regulated route | 42' 45' for a charter or regulated route |
| Articulated bus | ||
| Straight Trucks | 42' | 42' |
| Straight truck and trailer | 60' | 60' |
| Tractor-semitrailer combinations | NS | 65' |
| Semitrailer | 53' see KPRA | 53' see KPRA |
| Tractor-twin-trailer combination | NS for Class I & II highways. 65' center of front axle to center of rear axle for Class II highways. | 60' |
| Trailers of twin-trailer combinations | 28' 6" | NS |
| Boat-transporter combination | 65' | 60' |
| Overhang limitations | 3' front, 6' rear | |
| Stinger-steered boat-transporter | 80' | 60' |
| Overhang limitations | 4' front, 6' rear | |
| Auto-transporter | 65' | 60' |
| Overhang limitations | 3' front, 6' rear | |
| Stinger-steered auto-transporter | 80' | 60' |
| Overhang limitations | 4' front, 6' rear | |
| Saddlemount | 97' up to 3 | 60' |
| General overhang limitations | 3' | N/S |
| Drawbar | 15' | 15' |
| Dromedary | ||
| Kingpin to rearaxle | 45' 6" On Class I and II highways to the center of the rear axle, 42' 6" on Class III and other non-designated state highways. | 45' 6" On Class I and II highways to the center of the rear axle, 42' 6" on Class III and other non-designated state highways. |
| Length special limitations or restrictions | ||
| Weight: | Interstate and Defense Highways | Non-Designated (Other State Highways and Local Roads) |
| Steer axle | 20,000 | 20,000 |
| Single axle | 20,000 | 20,000 |
| Tandem axle | 34,000 | 34,000 |
| Tridem axle | 42,500 | 42,500 |
| Gross vehicle weight | 80,000 | 80,000 |
| Load per inch width of tire | 800 | 800 |
| Per wheel | ||
| Tolerances | ||
| APU allowance | 550 | 550 |
| Natural gas allowance | 2,000 | 2,000 |
| Weight special limitations or restrictions | Weight limits apply on all roads within Illinois unless posted otherwise. | |
Special Hauling Vehicle (SHV) registration allows certain vehicles to be exempted from the federal bridge formula while operating on Illinois highways. The following are exceptions to the bridge formula:
- A 3-axle discharge truck mixer registered as an SHV, used exclusively for the mixing and transportation of concrete in the plastic state, may when laden transmit upon the road surface, except when on part of the Interstates and designate highways, the following maximum weights: 22,000 pounds on a single axle; 40,000 pounds on a tandem axle; 54,000 pounds gross weight on a 3-axle vehicle.
- Except as provided in the item above, tandem axles on a 3-axle truck registered as an SHV, manufactured prior to or in the 2024 model year and first registered in Illinois prior to January 1, 2025, with a distance greater than 72 inches but not more than 96 inches between any two axles, is allowed a combined weight on the axles not to exceed 36,000 pounds and neither axle in the group can exceed 20,000 pounds (any of this vehicle type manufactured after December 31, 2024, may not exceed a combined weight of 34,000 pounds through the two axles and neither axle in the group may exceed 20,000 pounds). A three-axle combination sewer cleaning jetting vacuum truck registered as an SHV, used exclusively for the transportation of non-hazardous solid waste, manufactured before or in the 2014 model year, first registered in Illinois before January 1, 2015, may when laden transmit upon the road surface, except when on part of the Interstates and designated highways, the following weights: 22,000 pounds on a single axle; 40,000 pounds on a tandem axle; 54,000 pounds gross weight on a 3-axle vehicle.
- A 4-axle truck mixer registered as an SHV, used exclusively for the mixing and transportation of concrete in the plastic state, manufactured before or in the 2024 model year, first registered in Illinois before January 1, 2025, and not operated on Interstates and designated highways, is allowed the following maximum weights: 20,000 pounds single axle; 36,000 pounds on a series of axles greater than 72 inches but not more than 96 inches; and 34,000 pounds on any series of two axles greater than 40 inches but not more than 72 inches. The gross weights of the vehicle may not exceed the weights allowed by the bridge formula for four axles. The bridge formula does not apply to any series of three axles while the vehicle is transporting concrete in the plastic state, but no axle or tandem axle of the series may exceed the maximum weight permitted in this paragraph.
- Combinations of vehicles, registered as SHVs, that include a semitrailer manufactured prior to or in the 2024 model year and registered in Illinois prior to January 1, 2025, having five axles with a distance of 42 feet or less between extreme axles, may not exceed the following weights: 20,000 pounds on a single axle; 34,000 pounds on a tandem axle; and 72,000 pounds gross weight.
The SHV registration is $125 and can be obtained at the Commercial and Farm Truck Division office in Springfield, IL, and at Level 3 Secretary of State facilities. The office will issue a decal to be placed in the corner of the windshield on the passenger-side of the vehicle.
Call the Illinois State Police at (217) 782-6267 or the Commercial and Farm Truck Division at (217) 782-4815 for more information.
Bridge rules
The following table denotes maximum gross weights for vehicles on all highways:
| Distance | 2 Axles | 3 Axles | 4 Axles | 5 Axles | 6 or More Axles |
|---|---|---|---|---|---|
| 4 | 34,000 | ||||
| 5 | 34,000 | ||||
| 6 | 34,000 | ||||
| 7 | 34,000 | ||||
| 8 | 34,000* | 34,000 | |||
| Between 8 and 9 | 38,000 | 42,000 | |||
| 9 | 39,000 | 42,500 | |||
| 10 | 40,000 | 43,500 | |||
| 11 | 44,000 | ||||
| 12 | 45,000 | 50,000 | |||
| 13 | 45,500 | 50,500 | |||
| 14 | 46,500 | 51,500 | |||
| 15 | 47,000 | 52,000 | |||
| 16 | 48,000 | 52,500 | 58,000 | ||
| 17 | 48,500 | 53,500 | 58,500 | ||
| 18 | 49,500 | 54,000 | 59,000 | ||
| 19 | 50,000 | 54,500 | 60,000 | ||
| 20 | 51,000 | 55,500 | 60,500 | 66,000 | |
| 21 | 51,500 | 56,000 | 61,000 | 66,500 | |
| 22 | 52,500 | 56,500 | 61,500 | 67,000 | |
| 23 | 53,000 | 57,500 | 62,500 | 68,000 | |
| 24 | 54,000 | 58,000 | 63,000 | 68,500 | |
| 25 | 54,500 | 58,500 | 63,500 | 69,000 | |
| 26 | 55,500 | 59,500 | 64,000 | 69,500 | |
| 27 | 56,000 | 60,000 | 65,000 | 70,000 | |
| 28 | 57,000 | 60,500 | 65,500 | 71,000 | |
| 29 | 57,500 | 61,500 | 66,000 | 71,500 | |
| 30 | 58,500 | 62,000 | 66,500 | 72,000 | |
| 31 | 59,000 | 62,500 | 67,500 | 72,500 | |
| 32 | 60,000 | 63,500 | 68,000 | 73,000 | |
| 33 | 64,000 | 68,500 | 74,000 | ||
| 34 | 64,500 | 69,000 | 74,500 | ||
| 35 | 65,500 | 70,000 | 75,000 | ||
| 36 | 66,000** | 70,500 | 75,500 | ||
| 37 | 66,500** | 71,000 | 76,000 | ||
| 38 | 67,500** | 72,000 | 77,000 | ||
| 39 | 68,000 | 72,500 | 77,500 | ||
| 40 | 68,500 | 73,000 | 78,000 | ||
| 41 | 69,500 | 73,500 | 78,500 | ||
| 42 | 70,000 | 74,000 | 79,000 | ||
| 43 | 70,500 | 75,000 | 80,000 | ||
| 44 | 71,500 | 75,500 | |||
| 45 | 72,000 | 76,000 | |||
| 46 | 72,500 | 76,500 | |||
| 47 | 73,500 | 77,500 | |||
| 48 | 74,000 | 78,000 | |||
| 49 | 78,500 | ||||
| 50 | 79,000 | ||||
| 51 | 80,000 | ||||
| *If the distance between two axles is 96" or less, the two axles are tandem axles and the maximum total weight may not exceed 34,000 lbs, notwithstanding the higher limit resulting from the application of the bridge formula. ** Two consecutive sets of tandem axles may carry 34,000 pounds each if the overall distance between the first and last axles of these tandems is 36 feet or more. | |||||
Single vehicles having more than 4 axles may not exceed the weight in the table above for 4 axles measured between the extreme axles of the vehicle.
Single vehicles in combination having more than 6 axles may not exceed the weight in the table above for 6 axles measured between the extreme axles of the combination.
A vehicle or combination of vehicles that uses natural gas or propane gas as a motor fuel may exceed the above weight limitations by 2,000 pounds except on interstate highways. However, a vehicle shall not exceed any posted weight limit on a highway or structure.
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Copyright 2024 J. J. Keller & Associate, Inc. For re-use options please contact copyright@jjkeller.com or call 800-558-5011.