What does CS1, CS2, and CS3 mean for bridge weight restrictions?

Alberta Transportation’s Bridge Load Evaluation Manual v. 1.1 has more information. The following is from pages 25-26 in the manual:

"The single unit truck (single-unit vehicle) designation (CS1) applies to: 

  • a single unit truck; and 
  • a truck tractor and a semi-trailer, in the case where the inter-axle spacing between the truck tractor and the semi-trailer is less than 4.5 metres. 

The semi-trailer truck (two-unit vehicle) designation (CS2) applies to: 

  • a truck and a trailer; 
  • a truck tractor and semi-trailer, in the case where the inter-axle spacing between the truck tractor and the semi-trailer is 4.5 metres or more;
  • a mobile crane with a boom dolly;
  • a truck tractor in combination with a single axle semi-trailer and a semi-trailer;
  • a truck tractor in combination with a single axle semi-trailer and a pole trailer; and
  • a truck or truck tractor in combination with a pole trailer. 

The truck train (vehicle train) designation (CS3) applies to:

  • a truck tractor in combination with 2 or more trailers;
  • a truck and a full trailer with 2 tandem axles, in the case where the inter-axle spacing between the tandem axle groups is 5.0 metres or more;
  • a truck tractor in combination with a tandem axle semi-trailer and a semi-trailer; and
  • a truck tractor in combination with a tandem axle semi-trailer and a pole trailer."

Last Updated: March 12, 2021

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