It is the responsibility of the carrier and its drivers to be aware of weight and dimension restrictions that apply to their vehicles.

Provinces and territories have laws that establish maximum vehicle weights and dimensions.
This is to ensure public safety and to protect highway and road use infrastructure on all routes used by Northwest Tank Lines Inc and it’s drivers. A carrier must comply with all weight restrictions and dimensions for the roads they operate on throughout the year. Legal weights can depend on elements such as the type of vehicle, the number of axles on the vehicle, the manufacturer’s rating, and tire size.


Signage on Vehicles:

Once a carrier has calculated the weight of their vehicle, signs must be placed on the unit indicating that weight.. Commercial vehicles that either weigh or are registered for more than 4,500 kilograms must have the following information displayed on the left and right sides of the vehicle.
● The name or registered logo of the vehicle’s owner
● The Vehicle tare weight – Weight of vehicle when empty or not carrying a load.
● The licensed maximum gross weight of the vehicle (GVW)

The letters and numbers listed on the side of a vehicle must be at least 50 millimeters in height,
and must be a different color from their background so that the information is clearly visible.
All information of the vehicle must be accurate.


Maximum Dimensions:

A carrier and its drivers must also be aware of the actual size of their vehicles and load, as maximum dimensions apply. If a vehicle or its load is too high or wide, it may not be able to travel on certain routes because of the heights of bridges, and the width of roads.

Carriers may be eligible to obtain permits for the movement of vehicles or loads that exceed the
maximum dimensions or maximum legal weights.



Vehicles that exceed the maximum allowable weights or dimensions may be allowed to operate if
a carrier gets a permit. In Alberta, the government monitors, controls, and issues permits for the
movement of all over dimensional commercial vehicles. This is to ensure:
● The safety of the public
● To minimize the inconvenience to the traveling public
● To protect infrastructure
● To assist in the movement of items that cannot be divided, or are not economical to transport at legal dimensions
● To establish and communicate to the carrier a set of conditions for the safe movement of a load.


Road Bans:

In Alberta and BC roads are restricted to reduced-axle-weights due to seasonal conditions such as the spring thaw, construction and road maintenance, dimensional restrictions such as overhead structure and bridges, and weight restrictions due to maximum allowable weights. Carriers and drivers should always be aware that road restrictions or bans may change, which
may result in a driver having to take a different route. These types of restrictions help preserve the life span of Alberta and BC roads.

Northwest Operations and Safety will be responsible for monitoring road ban restrictions in all areas that we conduct business, and will pass this information onto drivers as required. Road ban weights are generally calculated depending on the jurisdiction. Road bans can range from 70 to 90% of axle weights and can also be time restricted throughout the day

For Road Ban calculations, please refer to the Liquid Propane Gas Product Handling Module or contact Northwest Operations or Safety. The LPG module can be found in a driver’s orientation and training manual or on the Driver Portal.