Modeling Operating Speed for Geometric Design Consistency and Safety Assessment of a Twolane Rural Highway located in Mountainous Terrain

Abstract

The objective of this study was to develop the operating speed models for evaluating the geometric design consistency of a two-lane rural highway passing through mountainous terrain. Speed data were collected from eighty-six horizontal curves of the Shillong bypass, located in Meghalaya, India. This study hypothesised that a single model would be incapable of predicting the operating speed observed at the horizontal curves superimposed with the vertical alignment and a further understanding of the driver s perception was needed.