Exploring the Association between Traffic Safety and Geometric Design Consistency Based on Vehicle Speed Metrics
Publication: Journal of Transportation Engineering
Volume 139, Issue 7
Abstract
Past design consistency research has demonstrated the relationship between operating speeds and geometric design features on two-lane rural highways. However, little is known about the relationship between geometric design consistency and traffic safety. In this study, design consistency is referred to as the difference between operating speed and inferred design speed, and design consistency density is measured to account for the effect of elements upstream and downstream of the study element. To perform the design consistency–safety evaluation in the present study, geometric design, roadway inventory, crash, and operating speed data were collected along two case-study highways in central Pennsylvania (U.S. 322 and PA 350). Several count regression model formulations were used to explore the statistical association between design consistency and total crash frequency. A statistically significant positive association between geometric design consistency and safety was found. Design consistency surrounding the study elements was also found to increase the expected crash frequency in the study element. The significant effects of design consistency and design consistency density measures on crash frequency for the two case-study sites indicate that there is value in further considering the relationship between design consistency and safety in future research, particularly in the context of the highway safety manual crash-prediction algorithm.
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Information & Authors
Information
Published In
Journal of Transportation Engineering
Volume 139 • Issue 7 • July 2013
Pages: 738 - 748
Copyright
© 2013 American Society of Civil Engineers.
History
Received: May 10, 2012
Accepted: Feb 15, 2013
Published online: Feb 18, 2013
Published in print: Jul 1, 2013
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