PROGRESS WITH RURAL TRAFFIC SIMULATION

This paper reviews progress in rural traffic simulation, with particular reference to the Australian Road Research Board Model, TRARR. A number of major simulation packages are identified which have been applied to practical studies of rural traffic performance in at least eight countries around the world. These models have many common features, as well as common areas requiring further research and validation. In this context, the current status of TRARR is discussed. Recent studies have applied the model to investigations of specific road improvement proposals and general concepts such as level of service. The model provides detailed comparisons of the changes in traffic performance which result from changes in road or traffic conditions. While further calibration and validation are required, tests have shown that errors in simulation results are quite small, especially when compared with uncertainties in other estimates required for road evaluation. In applying TRARR to specific studies, the procedures for data input have been refined to enable easier use of the model by unfamiliar users. The simulation package is now in a form which may be used by road authorities to compare alternative strategies (a). The number of the covering abstract of the conference is TRIS No. 368448. (TRRL)