Austroads Project TS1456 (Expanded Operating Speed Model) was established to update and expand the road design operating speed models used in Australia. In particular, the project reviewed the validity of the existing operating speed model for rural roads and identified adjustments to the model that reflect changes in driver speed behaviour. This included the deceleration of cars and heavy vehicles on horizontal curves and the influence of horizontal curves in sequence. This report documents the process used to collect and analyse speed data on horizontal curves, and assesses the implications in terms of the deceleration on curves for cars and trucks and the influence of curves in sequence. The report includes potential revisions for the existing operating speed model for horizontal curve. (Author/publisher)
Samenvatting