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Permissible weights

2020-2021 Winter Seasonal Weights

Please be advised that 2020-2021 Winter Seasonal Weights (WSW) will be allowed starting on Wednesday, November 18 in Climate Zone 3 (Thompson area), on Friday, November 20 in Climate Zone 2 (The Pas area) and on Monday, November 23 in Climate Zone 1B (Swan River area). 

REDUCIBLE LOADS: LEGAL/NORMAL AXLE WEIGHTS (M.R. 575/88)
Weights listed are maximums. Weight on steer axles are calculated at 10 kg/mm width of tire. All other axles are calculated at 9 kg/mm width tire.
Example: Truck tractor with 280mm tires for Normal and Winter Seasonal: 280 x 2 x 10 = 5600 kg. This would be the legal maximum for this tire size.

Axle GroupNormal Period WeightWinter Seasonal Weights
Steering AxlesRTACA1B1 RTACA1B1 
Single Steer – Truck Tractor6,000 kg6,000 kg6,000 kg6,000 kg6,000 kg6,000 kg
Single Steer – Truck Tractor Tridem drive axles (305 mm tire or less)7,3007,3007,3007,3007,3007,300
Single Steer – Truck Tractor Tridem drive axles (tire greater than 305 mm)7,3007,3007,3007,3007,3007,300
Single Steer – Straight Truck (305 mm tire or less)6,1006,1006,1006,10061006,100
Single Steer – Straight Truck (tire greater than 305 mm)7,3007,3007,3007,3007,3007,300
Tandem Steer – Straight Truck13,60013,60011,0001360013,60011,000
Single Axle9,1009,1008,20010,01010,0109,020
Tandem Axle (8 Wheel)17,00016,00014,50017,60017,60015,950
Tridem Drive Axles – Single Steer      
2.4 m to less than 2.7 m21,00021,00020,00021,00021,00020,000
2.7 m up to 2.8m22,00021,00020,00022,00021,00020,000
Tridem Drive Axles – Tandem Steer      
2.4 m to less than 2.7 m
(Wheelbase minimum of 7.7 m)
21,00021,00020,00021,00021,00020,000
2.7 m up to less than 3.0 m
(Wheelbase minimum of 7.8 m)
22,00021,00020,00022,00021,00020,000
3.0 m up to 3.1 m
(Wheelbase minimum of 7.9 m)
22,00021,00020,00022,00021,00020,000
Tridem Axles      
2.4 m to less than 3.0 m21,00021,00020,00021,00021,00020,000
3.0 m to less than 3.6 m123,00023,00020,00023,00023,00020,000
3.6 m to less than 3.7 m24,00023,00020,00024,00023,00020,000
Axle GroupSpring Restrictions Level 1
90% of Normal 
Spring Restrictions Level 2
65% of Normal
Steering AxlesRTACA1B1 RTACA1B1 
Single Steer – Truck Tractor5,500 kg5,500 kg5,500 kg6.5 kg/mm width of tire to maximum of 4,745 kg
Example: 280 mm tire
280 x 2 x 6.5 = 3,640 kg
Single Steer – Truck Tractor Tridem drive axles (305 mm tire or less)10 kg/mm width of tire to a maximum of 5,500 kg
Single Steer – Truck Tractor Tridem drive axles (tire greater than 305 mm)9 kg/mm width of tire to a maximum of 6,570 kg
Single Steer – Straight Truck (305 mm tire or less)10 kg/mm width of tire to a maximum of 5,500 kg
Single Steer – Straight Truck (tire greater than 305 mm)9 kg/mm width of tire to a maximum of 6570 kg
Tandem Steer – Straight Truck12,24012,2409,9008,8408,8407,150
Single Axle8,1908,1907,3805,9155,9155,330
Tandem Axle (8 Wheel)15,30014,40013,05011,05010,4009,425
Tridem Drive Axles – Single Steer      
2.4 m to less than 2.7 m12,28511,700–  8,8738,450–  
2.7 m up to 2.8m12,28511,700–  8,8738,450–  
Tridem Drive Axles – Tandem Steer      
2.4 m to less than 2.7 m
(Wheelbase minimum of 7.7 m)
12,28516,200–  8,87311,700  –  
2.7 m up to less than 3.0 m
(Wheelbase minimum of 7.8 m)
12,28511,700–  8,8738,450–  
3.0 m up to 3.1 m
(Wheelbase minimum of 7.9 m)
12,28511,700–  8,8738,450–  
Tridem Axles      
2.4 m to less than 3.0 m12,28511,700–  8,8738,450 –  
3.0 m to less than 3.6 m113,45511,700–  9,7188,450–  
3.6 m to less than 3.7 m13,45511,700–  9,71814,95013,000

1 A trailer tridem axle group with an axle spread of 3.0 m or more but less than 3.6 m is allowed 24,000 kg on routes with a designated maximum GVW of 63,500 kg.