2017 Manitoba Spring Road Restrictions (SRR) Program

Allowable Axle Weights

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 moved. 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 millimetre 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 millimetre 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 millimetre 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 millimetre 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 millimetre width of tire up to a maximum of 65% of the legal axle weights on Class A1 and Class B1 highways.

When transporting Essential Commodities, 10 kg/mm width of tire up to a maximum of 5,500 kg will be allowed for single steering axles on a Level 2 weight restricted road, in accordance with the Essential Commodities provisions. A list of Essential Commodities is provided for quick reference in the last page of this web site. 

Charts of Allowable Axle Weights

The information of allowable axle weights for standard axle configurations and typical tire sizes is available here:

Example of Allowable Axle Weights 

 Maximum Allowable Axle Weights for 305 mm (12 in.) Tires of Truck-Tractor (Equipped with Tandem Drive Axle) and Semi-Trailer

Axle Weights

Single Steering Axle, kg

Single Axle, kg

Tandem Axle, kg

Tridem Axle, kg

RTAC Level 1 (Legal)

5,500 (6,000)

8,190 (9,100)

15,300 (17,000)

20,700 (23,000)

A1 Level 1 (Legal)

5,500 (6,000)

8,190 (9,100)

14,400 (16,000)

20,700 (23,000)

B1 Level 1 (Legal)

5,500 (6,000)

7,380 (8,200)

13,050 (14,500)

18,000 (20,000)

A1 Level 2 (Legal)

3,900 (6,000)

5,915 (9,100)

10,400 (16,000)

14,950 (23,000)

B1 Level 2 (Legal)

3,900 (6,000)

5,330 (8,200)

9,425 (14,500)

13,000 (20,000)