Bell, Jack; Law, Rik; Li, Howell; Anderson, Ben; and Bullock, Darcy M., "New Opportunities for Automated Pedestrian Performance Measures" (2019). JTRP Affiliated Reports. Paper 38.
Date of this Version
pedestrian safety, vehicle conflicts, exclusive phase, occupancy ratio, video detection, automated traffic signal performance measures
Pedestrian safety is an important concern when evaluating intersections. Previous literature has shown that exclusive pedestrian phases improve safety, but at the expense of imposing greater pedestrian and motorist delay. However, outside of crash data, there are no easily implementable performance measures for pedestrians at traffic signals. This study proposes two performance metrics: (1) a time-to-jaywalk measure, and (2) the Conflict Occupancy Ratio (COR) for evaluating concurrent pedestrian signal phasing with turning vehicles. The COR quantifies conflicts between turning vehicles and pedestrians in the crosswalk. The COR is based upon a commercially deployed video detection system that correctly identified the presence of pedestrians to within two per cycle in this study. This performance is likely sufficient for the current application, but as the technology matures it will provide a scalable screening tool to identify intersections that have opportunities for capacity adjustments or warrant further direct field investigation.