Professional Driver's Handbook

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Vehicle dimensions

Subject to certain exemptions for farm equipment, "no person shall, without a permit issued pursuant to The Highways and Transportation Act, operate, move or cause to be operated or moved on or over a provincial highway or provincial road," any vehicle, object, contrivance or combination of vehicles which exceed certain prescribed dimensions.

Overhead clearance


A single vehicle must not exceed 12.5 m in length.

  • A combination of vehicles other than an A, B or C train must not exceed 23 m in length. You may tow more than one trailer. However, towing two trailers behind a car or light pickup increases the problems of stability in towing and braking. To make sure all vehicles are stable, the lead trailer must have at least two axles or be a fifth-wheel or gooseneck trailer. For example, if you are towing a camper and a boat, the camper must have two axles and must tow the boat. Fifth-wheel trailers or trailers with gooseneck hitches do not require two axles.
    Note: Each jurisdiction has its own rules concerning towing more than one trailer. Check other jurisdictions' requirements before you travel there.
  • A(n):
    • A or C train must not exceed 26 m in length.
    • B train must not exceed 27.5 m in length.


Red flags located on the extremities and along the edges of overdimension loads are required for travel during daylight hours. These flags warn other traffic of the size and location of over-dimension loads so they can take the necessary precautions when meeting or passing the over-dimension load.

Warning: The driver of a truck which has an overhang over the rear axle must exercise caution in narrow roadways and alleyways when negotiating tight turns. Allowances must be made for the overhang to avoid striking objects such as poles, parked cars, buildings, etc.


The maximum legal width, unless otherwise expressed in a permit, for a vehicle and its load on a provincial highway or provincial road is 2.6 m.

A rear vision mirror on the side of a vehicle may extend 30 cm past the width prescribed in the regulations or in a permit.

A tie-down device on the side of a vehicle may extend 10 cm past the width prescribed in the regulations or in a permit.

A tridem axle group or tandem axle group manufactured after June 1988 must not have a width less than 2.5 m measured from outside to outside tires.

A tandem axle group on a semi trailer manufactured after December 1991 must not have width less than 2.5 m measured from outside to outside tires.

A house trailer being moved between sunrise and sunset shall not exceed a width of 3.05 m.

A building, object or contrivance must not exceed 2.6 m in width.

Warning: Caution must be exercised by drivers of overwidth vehicles at narrow bridges, ravines, canyons and road construction areas. Drivers must also be careful that they do not strike signs, light poles or delineators with overwidth vehicles or loads.


The maximum height of a vehicle, building, object or contrivance is 4.15 m unless otherwise expressed in a permit. You must know the total height of your vehicle and load at all times. Special attention should be given for low overhead clearance which may not be posted. A few examples of such hazards are:

  • underpasses and tunnels
  • fire escapes in alleyways
  • boulevard tree limbs overhanging the roadway
  • service station and store canopies
  • low wires across residential driveways
  • repair shop and warehouse doors

Warning: During winter months, snow buildup on the road surface can reduce overhead clearance.


On all provincial highways and provincial roads, a permit is required when the height of your vehicle or load exceeds 4.15 m. Generally, overheight permits are restricted to non-divisible loads and loads deemed impractical to divide.

The overhead clearance on bridges and signs generally determines the maximum height allowable on a permit. However, heights allowed on many permits require that a driver must bypass certain structures that are lower than the height allowed on the permit.

Most power and telephone lines over provincial highways have a minimum clearance of 5.2 m. If the load exceeds this, the operator must check with SaskPower and SaskTel.

Some railway crossings have low overhead telegraph lines and overhead signals. When moving large loads over crossings, proper authorities should be contacted.

Buildings, objects or contrivances

A building, object or contrivance must not exceed 12.5 m in length, 2.6 m in width and 4.15 m in height.

Clearance lights

Clearance lights located at the extremities and along the edges of overdimension loads are required for travel during the night or in periods of reduced visibility. These lights outline over-dimension loads and provide a warning to other traffic using the highway.

Amber flashing (rotating) lights

Amber flashing lights are required on most units carrying overdimension loads. They must be located on the cab of the vehicle and spaced as widely as possible. These lights warn oncoming traffic of the presence of an over-dimension load, both during the day and at night.


Rev: 2017