When a load exceeds legal dimensions a permit is required and, depending on the dimensions, certain conditions must be followed. Legal Dimensions in Alberta are:

Width

• 2.6m

Height

• 4.15m

Length

• Single Vehicle - 12.5m
• Truck-Tractor and Semi-Trailer - 23.0m
• A and C Train Combinations - 26.0m
• B Train Combinations - 27.5m

Conditions for Movement

Over 8'7" wide (2.60m)

• Flags by day
• Warning lights by night

Over 10' wide (3.05m)

• As above PLUS 2 dimensional signs

Over 11' wide (3.35m)

• As above PLUS 1 or more flashing lights

Over 12'7" wide (3.85m)

• As above PLUS
• 1 pilot vehicle
  • behind - 4-lane
  • front - 2-lane
• No movement after 3:00 p.m. on day preceding weekend or a Stat
• No movement on Sunday or Stat. holiday

Over 14'7" wide (4.45m)

• As above PLUS
• On 2-lane 1 pilot and 1 trail vehicle
• On 4-lane
  • up to 18' (5.49m) needs 1 trail vehicle
  • over 18' (5.49m) needs 1 pilot and 1 trail vehicle
• No movement after 3:00pm on day preceding weekend or stat. holiday
• No movement on Sunday or stat. holiday
• DAYLIGHT HOURS ONLY

Over 24' wide (7.32m)

• 3 Escort Vehicles Required
• Must not detain School buses
• Notify RCMP
• No convoys

Over 17'4" high (5.30m)

• Notify power and telephone
• DAYLIGHT HOURS ONLY