Safety Effectiveness of Chevrons and Postmounted Delineators in Reducing Lane-Departure Crashes
Lane-departure crashes are the most predominant fatal crash type in Kansas. Therefore, attempts have been taken to reduce lane-departure crashes by implementing lane-departure countermeasures. This study was conducted to estimate crash modification factors (CMFs) to evaluate the safety effectiveness of chevrons and postmounted delineators which are commonly employed as countermeasures on two-lane curved road segments. A total of 500 two-lane curved road segments were considered and the crash frequencies were obtained for all lane-departure crashes and fatal and injury lane-departure crashes from 2013 to 2015. The cross-sectional method was used by developing generalized linear regression models assuming Poisson error distribution. To increase the representativeness of the model, driver, and environment-related variables were incorporated into the models in addition to road geometric and traffic-related variables. Estimated regression parameters of the respective countermeasures were used to calculate the CMFs. Based on the results, it was seen that both chevrons (CMF=0.67) and post-mounted delineators (CMF=0.68) reduce all lane-departure crashes. Furthermore, it was seen that both chevrons (CMF=0.65) and postmounted delineators (CMF=0.64) have an even higher crash reduction effect on fatal and injury lane-departure crashes. These results can be used as a decision-making tool when implementing countermeasures on two-lane curved road segments where high crash frequencies are observed.
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Availability:
- Find a library where document is available. Order URL: http://worldcat.org/isbn/9780784481530
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Supplemental Notes:
- © 2018 American Society of Civil Engineers.
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Corporate Authors:
American Society of Civil Engineers
1801 Alexander Bell Drive
Reston, VA United States 20191-4400 -
Authors:
- Galgamuwa, Uditha
- Dissanayake, Sunanda
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Conference:
- International Conference on Transportation and Development 2018
- Location: Pittsburgh Pennsylvania, United States
- Date: 2018-7-15 to 2018-7-18
- Publication Date: 2018-7
Language
- English
Media Info
- Media Type: Web
- Features: References;
- Pagination: pp 336-345
- Monograph Title: International Conference on Transportation and Development 2018: Connected and Autonomous Vehicles and Transportation Safety
Subject/Index Terms
- TRT Terms: Crash modification factors; Crash rates; Highway delineators; Lane keeping; Road markings
- Geographic Terms: Kansas
- Subject Areas: Highways; Operations and Traffic Management; Safety and Human Factors;
Filing Info
- Accession Number: 01867083
- Record Type: Publication
- ISBN: 9780784481530
- Files: TRIS, ASCE
- Created Date: Dec 13 2022 10:05AM