The results of the continuing programme of monitoring using the TRRL weighscale, and the results of static axle weighing surveys, have been used to study trends in axle loading and their effect on the design of road pavements. The results have been analysed to show how the effect of commercial vehicles has changed with time and how it is related to vehicle type. There is particular emphasis on recent changes in regulations that have allowed higher gross weight vehicles and led to the appearance of considerable numbers of five axle articulated vehicles of 38 tonne gvw, and some six axle vehicles. The results of the analysis have been used to provide procedures for the estimation of the effect of commercial vehicles on the design and performance of road pavements for past, present and future years.

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