Taken from the Commercial Vehicle Dimension and Weight Regulation AR315/2002, Part 1, Sub Section 6

The provisions of Section 4 with respect to the width of a commercial vehicle do not apply to

• a. A rubber tired tractor equipped with a dozer blade, if conspicuously displayed on each side of the widest part of the farm tractor, or displayed at the extremities of the blade, there are,
  • i. When the farm tractor is used during daylight, warning flags, and
  • ii. When the farm tractor is used during darkness,
    • A. Warning lights, or
    • B. Warning flags made of fluorescent material that are adequately illuminated by the farm tractor’s working lights;
• b. Farm equipment loaded on a trailer
  • i. During daylight, if warning flags are displayed at the widest part of the vehicle or load, or
  • ii. During darkness, if warning lights are displayed at the widest part of the vehicle or load;
• b1. A trailer or its load, if
  • i. The trailer and its load are less than 3.8 meters in width,
  • ii. The trailer and its load are being towed by a farm tractor, and
  • iii. The trailer is being used to move materials incidental to farm operations from one farm or field to another farm or field or from one portion of the farm or field to another portion of the farm or field;
• c. Any other farm equipment
  • i. During daylight, or
  • ii. During darkness, if warning lights are displayed at the widest part of the vehicle or load.

To view the Commercial Vehicle Dimension and Weight Regulation in its’ entirety, please follow the below link:

https://www.qp.alberta.ca/documents/Regs/2002_315.pdf