Truck control problems posed by the design of highway ramps.

A research study is described in which accidents experienced by tractor-semitrailers on expressway ramps were seen to depend largely upon the interaction between highway geometric and vehicle dynamic behaviour. The geometric of each ramp were fully defined in a computer simulation such that the dynamic behaviour of example tractor-semitrailers could be examined. The paper presents the results of the combined study of accident data, simulated vehicle response, and the geometric details of ramp design.