Friday Transportation Seminar: Safety Effectiveness of Pedestrian Crossing Treatments

Event Date: 
Friday, October 13, 2017, 12:00pm to 1:00pm PDT
Speaker(s): 
Chris Monsere, Portland State University
Cost: 
Free
Credit: 
PDH: 1 | AICP: 1 (#9135424)

LOCATION: PSU, Urban Center Building, Room 204 (Distance Learning Center Wing)
LIVESTREAM ONLINE: Click here on the day of the seminar to stream it live

SEMINAR VIDEO


SEMINAR SLIDES
Missed the presentation or want to look back at the slides? View the slides here.

PROFESSIONAL DEVELOPMENT
This 60-minute webinar is eligible for 1 hour of professional development credit for AICP (see our provider summary). See here for a Certificate of Attendance for those who track professional development hours.

SUMMARY
Over the last decade, the transportation agencies in Oregon have systematically enhanced many pedestrian crossings at mid-block locations with Rectangular Rapid Flashing Beacons (RRFBs), Flashing Yellow Beacons (Flash), and high visibility crosswalk markings (Hi-Vis). Enhancements often included the installation of refuge medians. This study explored the safety performance of these enhanced crossings, categorized by enhancement type. Data were collected on 191 crossings that included installation year, geometric features, surrounding land use, traffic volumes, and the number of crashes. Because pedestrian volume at the locations was unavailable, a pedestrian activity level variable was developed. Target crashes for analysis were identified as pedestrian and rear-end. The analysis of the before-after crash patterns showed a reduction in the pedestrian crash severity after the installation of the crosswalk enhancements. Risk ratios, calculated by the unadjusted crash frequency relative to the years of operation in each analysis category, were calculated. For pedestrian crashes, risk ratios increased with the number of lanes, posted speed, and estimated pedestrian activity level. Similar trends were observed for rear-end crashes. Due to sample size limitations, safety effectiveness was only estimated for the 19 RRFBs locations. Lack of pedestrian volumes limited the development of a safety performance function (SPF) for the pedestrian crash types. However, a rear-end crash SPF was estimated. Standard methods to estimate a crash modification factor (CMF) were attempted. The recommended CMF for pedestrian crashes is 0.64 +/- 0.26 using a simple before-after analysis and 0.93 +/- 0.22 for rear-end crashes using an empirical Bayes analysis.

THE SPEAKER
Chris Monsere is Chair and Associate Professor of Civil and Environmental Engineering in the Maseeh College of Engineering & Computer Science at Portland State University. Dr. Monsere’s primary research interests are in the areas of multimodal transportation safety; management and dissemination of large transportation datasets; and improvements in transportation operations. Monsere received his BCE from the University of Detroit Mercy; his MSCE and Ph.D.with an emphasis in transportation from Iowa State University. Dr. Monsere is a licensed professional engineer in the state of Oregon.

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