Illinois State Shipping Regulations for oversize and heavy haul.

2021 Shipping laws and regulations for shipping oversize and over-weight loads in the state of Illinois.


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Legal load limits in Illinois.
Illinois DOT legal load size & weight limitations.

Legal Loads.
Length:  65’ overall length maximum.
Width: 8’6” on the interstate and other designated highways, 8’ on non-designated highways.
Weight:  GVW 80,000,  Single 20,000, Tandem 34,000,   Tridem 42,000
Height:  13’6” is the maximum allowed height for legal loads.
Overhang:  3’ front in the front and 3’ off of the rear of the trailer.

Routine oversize shipping, trucking and transport permits.
Oversize and overweight trucking permits that are routinely issued by the state of Illinois.

Length:  Up to 145’ long. Anything longer refer to the superload section below.
Weight:  Single 24,000, tandem: 48,000, tridum: 60,000, Quadem: 60,00 gross, 5 Axles 100,000 lbs., 6 Axles 120,000 lbs., 7 axels: 120,000, 8 axles: 120,000 lbs.
Width: 14’6” (any load over 16′ will require special admin approval before a permit is issued).
Height: 15’ (any load over 16′ tall requires a route survey).

Superload information:
Illinois DOT superload information.

Length: Any load that is longer than 145′ is considered a superload.
Width: Any load that is in excess of 14′ 6″ in width is considered a superload.
Height: Any load that is in excess of 15′ 6″ in height is considered a superload.
Weight: Any load that exceeds 120,000 lbs on any standard axle configuration whether it’s a 6,7 or 8 axle configuration or not is considered a superload.
Overhang: Contact them as this varies depending on the route.
Notes: Spacing between steer and first tandem must be more than 8′ 1″. The spacing before the first axle and the trailer must not exceed 18′ 6″.  All axle spacings combined must not be less than 43′ 6″. Superload permit processing times vary. Expect delays. Before requesting a route you are expected to do as much research on your own as possible. They will refer you to GettingAroundIllinois for construction zones and other closures. 

Permitted travel times and restrictions in Illinois:
Illinois travel times and restrictions for oversize loads.

Travel is permitted from ½ hour before sunrise to ½ hour after sunset  Monday thru Friday and ½ hour before sunrise until 12PM on Saturdays. Loads that are overweight only may travel 24/7 on all days of the week (make certain it is not documented otherwise on your permit before doing so). No travel is permitted on Sundays unless you are below the routine permit standards of no more than 115′ in length, 12′ in width, 13′ 6″ in height (sunrise to sunset rules apply).  No movement is permitted on the major holidays: New Years Day, Memorial Day, Independence Day, Labor Day, Thanksgiving Day, and Christmas Day. Travel stops at 12PM on the day before any of these holidays. The Illinois oversize load permit office is closed on MLK Day, Lincoln’s birthday, Washington’s birthday, Columbus Day, Election Day, Veterans Day, and on the day after Thanksgiving. However, travel is not restricted on these days. Always refer to your permit for approved travel times.

Required shipment, truck and trailer markings:
Truck, trailer, and shipment required signs, banners, and flags.

A rotating amber light must remain on at all times mounted on top of the cab and be visible from 360 degrees from a minimum of 500′ in direct sunlight. If your overall length is more than 80′ in length you are required to have one amber light over the cab of the truck and one amber light no more than 10′ from the rear of end or trailer/load at the highest point that is practical. Oversize load signs must be a minimum of 7′ in width x 18″ in height, have a yellow background color with black lettering no less than 10″ in height x 1″ thick – we have recently heard 12″ tall x 2″ thick so please clarify and comment below if you know which is correct. Flags are required at all 4 corners of the load and front of the truck and are to be safety red in color and no less than 18″ square. Shipments over 75′ in length, 10′ in width, or 14′ 6″ in height are required to have signs. Signs must be placed on the front and rear extremities of the truck, trailer, or load.

When pilot cars are required:

Length: If over 110′ in length you are required to have a minimum of 1 pilot car and in some places 2 pilot cars (higher traffic density or certain times of year). If over 145′ (150′ in some very rural areas) in length you are required to have 3 pilot cars –  yes 3. If over 175′ in length a police escort will be required.
Width: Up to 14’6” requires 1 pilot/escort vehicle. Over 16’ requires 2 pilot/escort vehicles. Over 18′ in width will require a police escort. 
Height: Up to 14’ 6” 1 pilot/escort vehicle, over 16’ requires 2 pilot/escort vehicles. Over 18′ in height will require a police escort.
Weight: No requirements as long as you can maintain minimum speeds. However, on bridge moves that require all other vehicle traffic to be removed will require an appropriate number of pilot cars which is a minimum of 2 and possibly 3 with police escort. All areas are different and require evaluation.
Note: If you exceed any two dimensions, then you are required to have an additional pilot car. So if you’re over 14′ 6″ tall and 14′ 6″ wide you would be required to have 2 pilot cars.  

Required pilot car certifications:

Cars, vans, or trucks may be used as long as the gross weight of the pilot car vehicle is rated at no more than 8,000 lbs. Pilot car driver must be 18 years of age minimum with a valid regular driver’s license. Pilot cars must have a rotating or flashing amber light mounted on the top of the vehicle. Must display a red flag at all 4 outermost points of the vehicle and have “OVERSIZE LOAD” signs that are a minimum size of 5′ wide x 12″ tall and have black lettering no less than 8″ in height. Must have radio and be in constant communication with the driver transporting the shipment at all times. Must have $500,000 per occurrence combined insurance that covers property and body.

How to apply for trucking permits:

Illinois Department of Transportation – DOT
Bureau of Traffic, 2300 S Dirksen Parkway
Springfield, IL  62764

Email: dot.permitoffice “at”
General inquiry phone: 217-782-6273
Phone: 217-785-1477 or 800-252-8636 within the state.
Fax: 217-728-3572

Note: Fee varies depending on dimensions and miles traveled. A permit is valid for 5 days.

Hours: from 8 AM until 4:30 PM

Central Time Zone


The information contained in these pages is research information primarily for use by oversize and overweight trucking company drivers, dispatchers, and pilot car companies. While every effort is put into maintaining the accuracy of this information you must absolutely verify this information with the Illinois State DOT Permits office before commencing movement.


Manitoba Frost Laws

2020 Manitoba winter frost/spring thaw laws and seasonal weight restrictions.

Manitoba Spring Road Restrictions (SRR) program.

The Manitoba Ministry of Infrastructure divides its province into three sections, with each section having a unique thaw restriction start and end date. In 2020, it will begin its spring road restrictions for Region A and Region B of the province at 6 a.m. on Friday, March 10. Weight restrictions are scheduled to end at 11:59 p.m. on Wednesday, May 31.

The allowable axle weights on weight restricted roads during the spring season are based on the percentages of the legal axle weights, with some exceptions for the single steer axles and in situations where essential commodities are being shipped. There are two levels of spring weight restrictions in Manitoba depending on the strength and surface conditions of the pavement structures. The Level 1 weight restriction applies to weak pavements while the Level 2 weight restriction applies to very weak pavements. The allowable axle weights on different axle configurations are calculated as follows:

Level 1 Spring Weight Restrictions:

  1. On a single steering axle of a single or tandem drive truck tractor:
    • 10 kg per millimeter width of tire up to a maximum of 5,500 kg on all highways.
  2. On a single steering axle of a straight truck or a tridem drive truck tractor:
    • Tire size 305 mm or less: 10 kg per millimeter width of tire up to a maximum of 5,500 kg on all highways.
    • Tire size greater than 305 mm: 9 kg per millimeter width of tire up to a maximum of 6,570 kg on all highways.
  3. On a tandem steering axle group of a straight truck:
    • 9 kg per mm width of tire multiplied by 0.90 (download factor) up to a maximum of 12,240 kg on RTAC Routes or Class A1 highways and up to a maximum of 9,900 kg on Class B1 highways.
  4. On all other axle groups:
    • 9 kg per millimetre width of tire up to a maximum of 90% of the legal axle group weights on all highways.

Level 2 Spring Weight Restrictions:

  1. On all single steering axles of all vehicle configurations:
    • 6.5 kg per millimeter width of tire up to a maximum of 65% of the legal axle weights on Class A1 and Class B1 highways.
  2. On a tandem steering axle of a straight truck:
    • 6.5 kg per millimeter width of tire multiplied by 0.90 (download factor) up to a maximum of 8,840 kg on Class A1 highways and up to a maximum of 7,150 kg on Class B1 highways.
  3. On all other axle groups:
    • 6.5 kg per millimeter width of tire up to a maximum of 65% of the legal axle weights on Class A1 and Class B1 highways.

Road restrictions for Region C, the northern most regions, will begin at 6 a.m. on Sunday, March 12, and end at 11:59 p.m. on Saturday, June 10. Region C is defined as the rest of the province north of the virtual line in Region B.

Spring Weight Restrictions are classified as Level 1 and Level 2 (see table below).


Example of Maximum Allowable Axle Weights. Level 1 Spring Weight Restriction, Reduce Axle Weights to 90% Maximum Allowable Weights. Level 2 Spring Weight Restriction, Reduce Axle Weights to 65% Maximum Allowable Weights. A complete list of Charts of Allowable Axle Weights can be found at the following link:

Manitoba Spring Road Restrictions Program:


Manitoba publishes a list of road bans as conditions change. Go to the above link and look for “Road Bans” in the left column. These bans identify specific roadways and the ban imposed in percent of rated axle capacity.

It is important for truck drivers and trucking company dispatchers to make certain they are operating in accordance with the Manitoba posted frost laws, seasonal load weight and speed restrictions that are posted. Changes to these restrictions is subject to change hourly during the winter and spring months. You are expected to be aware of these changes and operate accordingly. It is possible that heavy fines may be levied as well as your truck being ordered out of service and not permitted to travel. We suggest you bookmark this page for future reference.

Seasonal weight restrictions limit the maximum weight of vehicles allowed to travel on certain roads as a way to help prevent damage and protect public investment in the roadways.

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