Validating Spring Weight Restriction Limits with Mechanistic–Empirical Failure Prediction Models

This study developed local mechanistic–empirical failure models to predict fatigue and rutting damage on spring-weight-restricted (SWR) roads in Manitoba, Canada. The local models were used to assess the SWR load limits and to validate the current SWR deflection levels that regulate commercial vehicle weights during the spring period. The local model predictions were compared with the damage models of the Asphalt Institute (AI) and the Mechanistic–Empirical Design Guide (MEPDG). The results indicated that the predicted equivalent single-axle load repetitions to fatigue failure from the local model were higher than those of the MEPDG and the AI models by an average of 37% and 20%, respectively. On the basis of the local model equivalent single-axle load predictions, the current SWR deflection limits used in Manitoba appear to be a reasonable method for regulating B-Train operations during the spring period.