The authors thank the Oregon Department of Transportation (ODOT) and the Federal Highway Administration (FHWA) for funding this research. The Technical Advisory Committee has provided valuable input throughout the project (Craig Black-ODOT, Scott Cramer-ODOT, Julie Kentosh-ODOT, Katie Johnson-ODOT, and Bikram Raghubansh-Clackamas County). Additional students at Oregon State University helped reduce data and code the simulator environment (Kayla Fleskes, MS, Ellie Simpson, MS, Hameed Aswad Mohammed, PhD, Hagai Tapiro, Post-Doctoral researcher, and Logan Scott-Deeter, undergraduate). The project was managed expertly by Mark Joerger, ODOT Research Coordinator.
Traffic safety -- Oregon, Pedestrians -- Oregon, Automobile drivers -- Behavior -- Analysis, Pedestrians -- Safety measures
This research aimed to develop an understanding of the safety and operational implications of using the flashing yellow arrow (FYA) in permitted and protected/permitted right turn (PPRT) operations to maximize safety and efficiency. This report includes a review of more than 50 scientific and technical articles on the selection of right turn phasing alternatives and a review of Oregon crash data at intersections with exclusive right-turning lanes from 2011-2013. The study had three phases: 1) a web-based survey, 2) a microsimulation model, and 3) and a driving simulator study. The survey measured Oregon driver’s comprehension of right-turn signal display. Analysis revealed a general misunderstanding of the required driver response for the steady red arrow signal indication, but comprehension of the FYA for right turns was high. The microsimulation model of several PPRT phasing alternatives indicated that the pedestrian volumes had the greatest effects on delays. The driving simulator experiment indicated that driver responses were relatively consistent with those observed in the web-based survey. The results suggest that Oregon transportation agencies might improve driver-yielding behavior and pedestrian safety at signalized intersections with high volumes of permissive right turns from exclusive right-turn lanes by using the FYA display in lieu of a steady circular green display.
Hurwitz, D., Monsere, C., Kothuri, S., Jashami, H., Buker, K., Kading, A. PROJECT SPR 789 | REPORT NO.: FHWA-OR-RD-18-14. Portland, OR: Transportation Research and Education Center (TREC), 2018. https://dx.doi.org/10.15760/trec.214