A Parsimonious Model For The Safety
Assessment Of Horizontal Curves
Using Data From Rural Roads
Author(s)
E. Matsoukis
Abstract
The safety of a horizontal curve (by means of accident frequency and degree of
severity) is examined in this paper by features internal and external to it; both of
these characteristics affect the driver attitude and the curve approach speed.
Based on a review of the available literature on the subject, first the relationship
between accident rate and some of the most important curve characteristics is
examined. Then data from rural highways in Greece is used to investigate the
relationship between accident rate and degree of curve or the curve radius. The
flexible family of Gamma distributions is selected for this analysis and models
using a special form of it (the shifted negative exponential distribution) are
defined. The estimated functional forms are presented in conjunction with those
from the literature and conclusions are drawn.
Keywords: horizontal alignment, horizontal curves safety, rural roads, road
geometric characteristics.
1 Introduction
Highway engineering includes an explicit trade-off between the improvement of
the speed and throughput of highways and maintaining safe operating levels. The
safe and efficient movement of traffic is greatly influenced by the geometric
features of the highway. Accident trend analyses often lead to the observation
that accidents tend to cluster in specific spots, including intersections and curves.
Understanding the reasons that determine the safety level is instrumental in
improving road safety.
Keywords
horizontal alignment, horizontal curves safety, rural roads, road
geometric characteristics
Related Book
Other papers in this volume
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