Effect of novel divergence markings on conflict prevention regarding motorcycle-involved right turn accidents of mixed traffic flow
Journal
Journal of Safety Research
Journal Volume
69
Pages
167-176
Date Issued
2019
Author(s)
Abstract
Introduction: In Taiwan, segregated traffic flow countermeasures have long been in place. Although these facilities have decreased the numbers of motorcycle left-turn collisions, right-angle collisions, and sideswipe collisions, they have also induced serious right-turn accidents. The purpose of this research was to evaluate an intervention intended to decrease conflicts and motorcycle-involved crashes. In this study, the reasons why the motorcycle accident rate is higher at intersections with slow lanes than at those without slow lanes are presented, and the theory of the self-explaining road was applied to create divergence markings for a mixed traffic flow environment. An intervention that guides motorcycles and cars into appropriate locations at intersections was applied to three intersection approaches. Method: The intervention effectiveness was evaluated by comparing the number of accidents at the intersections before and after the implementation of improvement measures. Moreover, video recordings were used to analyze the traffic distributions at the cross-sections of intersections. T-test was adopted to examine whether the traffic flows at the cross-sections of the intersections before and after the intervention were statistically different. In addition, this research applied the post-encroachment time (PET), the time between the first road user leaving the encroachment zone and the second road user arriving in it, to evaluate traffic conflicts. Finally, the PET and severity index between a straight-through motorcycle and a right-turn vehicle were analyzed. Results: PET increased by 3.2%–20.4%, and the rates of right-turn collisions, sideswipe collisions, and rear-end collisions decreased by 64.3%, 77.3%, and 61.5% respectively. Conclusions: Eliminating the slow traffic lane and setting divergence markings may not effectively cause vehicles in different driving directions to drive in the proper locations in the lanes. However, divergence markings both reduce the rate of right-turn collisions and decrease the incidence of sideswipe and rear-end collisions. Practical applications: The proposed design method may be a good design reference for countries having a high motorcycle density. ? 2019
Subjects
Before and after; Divergence markings; Post-encroachment time; Self-explaining road
Other Subjects
Accidents; Behavioral research; Information dissemination; Motorcycles; Road and street markings; Roads and streets; Video recording; Before and after; Conflict prevention; Improvement measure; Intervention effectiveness; Post-encroachment time; Rear-end collisions; Self-explaining road; Traffic distributions; Street traffic control; accident prevention; car driving; environmental planning; human; motorcycle; pilot study; prevention and control; psychology; risk assessment; risk reduction; traffic accident; Accident Prevention; Accidents, Traffic; Automobile Driving; Conflict, Psychological; Environment Design; Humans; Motorcycles; Pilot Projects; Risk Assessment; Risk Reduction Behavior
Type
journal article