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.

• Record URL:
  https://doi.org/10.1061/9780784481530.034
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/isbn/9780784481530
• Supplemental Notes:
  • © 2018 American Society of Civil Engineers.
• Corporate Authors:

  American Society of Civil Engineers

  1801 Alexander Bell Drive
  Reston, VA  United States  20191-4400
• Authors:
  • Galgamuwa, Uditha
  • Dissanayake, Sunanda
• 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