01334642

Component

https://doi.org/10.3141/2264-17

http://scholar.google.com...rlow&publication_year=2011

This paper describes the development and implementation of the conflict-based assessment of pedestrian safety (CAPS) methodology for the evaluation of pedestrian accessibility at complex intersections. Significant research has explored pedestrian access to modern roundabouts and other complex intersections, and a significant focus has been placed on accessibility for pedestrians who were blind. A majority of these studies relied on actual street crossings by study participants under the supervision of a trained orientation and mobility specialist. These crossing studies quantified risk from a measurement of intervention events, in which the orientation and mobility specialist had to physically stop the participant from crossing. Although such studies provide useful data on the crossing risk at a particular intersection, street crossings can be dangerous to the study participants and are time-consuming and expensive to conduct. The CAPS method emphasizes the use of conflict-based safety factors to quantify risk in a framework compatible with indicator studies. This method relates pedestrian crossing decisions to advanced measurements of vehicle dynamics to estimate lane-by-lane conflicts and identifies the grade of conflict on the basis of a five-criterion rating scale. The CAPS framework was applied to a study of crossings by blind pedestrians at a multilane roundabout. The resulting risk scores were calibrated from the actual orientation and mobility interventions observed during the study. The calibrated CAPS framework correctly matched all (high-risk) orientation and mobility intervention events and further identified other (lower-risk) pedestrian–vehicle conflicts. The CAPS framework provides a more efficient, objective, and consistent safety assessment of pedestrian crossings in a research context, without the need for pedestrians to step into the roadway.

01365021

11-3798

English

pp 148-155

2011

Transportation Research Record: Journal of the Transportation Research Board

9780309223010

Print

Figures (2) ; References (18) ; Tables (4)

Accessibility; Blind persons; Crosswalks; Evaluation and assessment; Intersections; Pedestrian safety; Pedestrian vehicle interface; Performance measurement; Risk analysis; Roundabouts

Pedestrians and Bicyclists; Safety and Human Factors; I83: Accidents and the Human Factor

TRIS, TRB

Feb 17 2011 6:38PM

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