Evolution of Bridge Live Load Models and Truck Weight Limits:The Case of Manitoba, Canada

Truck size and weight regulations have been a key instrument used to improve trucking productivity, safety, operational performance in Canada. In response these changes, bridge design codes undergo modifications envelop the potential range of trucks operation. A five-decade timeline is presented: (1) document how their live load models evolved, with focus on Manitoba-specific HSS-25 truck, (2) discuss responsive historically changes truck regulations. While at times are released conjunction expected regulation there often delay issuance revised evaluation codes. Assessments current fleet, which now includes long combination vehicles (LCVs), may be consideration for future models.