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Operating a truck-tractor
and semi-trailer

Size and weight restrictions
of commercial vehicles

Commercial vehicles must not be more
than the following dimensions:
• 2.6 metres in width. If the vehicle is
  wider than 2.05 metres, clearance lights
  are required. These must be amber in
  the front and red in the rear.
• 4.15 metres in height from the
  ground surface
• 12.5 metres in length for a straight truck
• 6.2 metres in wheelbase length for a
  truck-tractor
• 23 metres in overall length for a tractor
  semi-trailer or truck and towed trailer
  combination
• 25 metres in overall length for
  Transportation Association of Canada
  (TAC) vehicle combinations consisting of
  A, B and C trains.

 

No vehicle or combination of vehicles
will be allowed to operate on a highway
if the weight on a tire, axle or axle groups
or gross vehicle weight is more than what
is allowed under the Commercial Vehicle
Dimension and Weight Regulation (AR
315/2002).

Specialized, oversized or overweight
equipment requires a special permit. The
permit will have specific conditions on it.
These conditions will state:
• the routes you may travel on
• the days and hours of travel
• the type of equipment that
  must be used
• anything else that is needed to prevent
  road damage and to ensure safety.

Air Brakes

Detailed air brake information can be
found in the Alberta Air Brake Manual.
This Manual will be given to you when you
complete the Alberta Air Brake Program
at a licensed driving school or certified


40 A Commercial Driver’s Guide to Operation, Safety and Licensing

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