Quantitative Measurement Procedures for Pedestrian Service at Signalized Intersections

A Case Study at a Skewed Intersection
Source: Transportation Research Board

"The pedestrian level of service (LOS) for signalized intersections in the Highway Capacity Manual (HCM) is based on pedestrian delay and crosswalk capacity. While delay and capacity are important parameters, the HCM does not consider other factors such as likelihood of a pedestrian successfully and safely completing a crossing maneuver within the allotted time. This paper presents a case study evaluating pedestrian service based on three discrete pedestrian crossing outcomes: non-conflicting, compromised, and failed. These pedestrian outcomes provide a quantitative means for assessing the pedestrian service at a signalized intersection. The case study consists of four crosswalks at a skewed intersection. The results of the case study indicate that one of the four pedestrian crosswalks exhibits a significantly higher rate of compromised and failed pedestrian crossings. At this intersection, the greatest incidence of failed and compromised pedestrian service is observed at the crosswalk where there is a moderately high volume of right turns and these right turns are served by an exclusive right turn lane that subtends an obtuse angle with a large turning radius. The results of this pedestrian outcome based assessment are then compared with the results from existing pedestrian LOS methodologies."

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