Transportation Seminars at Portland State University have been a tradition since 2000. We've opened up PSU Transportation Seminars to other days of the week, but the format is the same: Feel free to bring your lunch! The seminar begins at 11:00 AM and goes until noon. If you can't join us in person, you can always watch online via Zoom: Register Here.
As part of work committed towards reducing pedestrian-motor vehicle conflicts and crashes at signalized intersections, researchers within the AZTrans Lab at Northern Arizona University worked with the City of Phoenix, Arizona to develop data driven qualitative public facing guidelines for Leading Pedestrian Interval (LPI) implementation within the City of Phoenix.
The first step was to conduct a comprehensive literature review regarding implementation and operation of the LPI, with particular attention paid to operational guidance published by North American jurisdictions regarding implementation guidelines, user feedback, hardware performance, as well as the impact of RTOR and FYA on pedestrian conflicts.
Next, a crash analysis using Arizona Department of Transportation crash data (from 2016-2022) was conducted to identify priority locations (locations with high amounts of pedestrian-motor vehicle crashes) for collection of pedestrian – motor vehicle conflicts. Eight crosswalks at four sites were identified, and 10 hours of video was collected at each crosswalk with and without an LPI (160 hours of video total).
Then, in an office setting, student researchers watched the video and logged Post-Encroachment Time (PET) for pedestrian – motor vehicle conflicts with an interaction time of 5s or less, pedestrian movement direction during interaction, vehicular movement direction during interaction, conflicting vehicle volume, temporal location of interaction within green interval, physical location of interaction within crosswalk, vehicular and pedestrian compliance with regards to signal indications, and other pertinent data.
From this data, PET trends were identified wither respect to conflict location, and used to develop public facing guidelines for LPI implementation. This presentation will profile this work, as well as present lessons learned and ideas for future research.
KEY LEARNING OUTCOMES
- Insights on the interactions between pedestrians and motor vehicles at signalized intersections with and without an LPI employed
- Guidance on site and user variables that may increase the expected number of conflicts between pedestrians and motor vehicles at signalized intersections
- Information on strategies that can be used to improve pedestrian safety at signalized intersections
SPEAKER
Edward J Smaglik, Ph.D., P.E.
Dr. Edward J. Smaglik, P.E., is a Professor at Northern Arizona University (NAU), Flagstaff, AZ, in the Department of Civil Engineering, Construction Management, and Environmental Engineering. The Director of AZTrans: The Arizona Laboratory for Applied Transportation Research, Dr. Smaglik has over 13 years of academic research and teaching experience, preceded by 2 years of experience as a post-doctoral research associate. Dr. Smaglik currently serves as Chair of the TRB ACP25 Traffic Signal Systems Committee and his research focuses on advanced uses of vehicle detection, traffic signal systems analyses, transportation performance measures, and multimodal operations.
PROFESSIONAL DEVELOPMENT
This 60-minute seminar is eligible for 1 hour of professional development credit for AICP (see our provider summary). We can provide an electronic attendance certificate for other types of certification maintenance.
Portland State University's Transportation Research and Education Center (TREC) is a multidisciplinary hub for all things transportation. We are home to the Initiative for Bicycle and Pedestrian Innovation (IBPI), the data programs PORTAL and BikePed Portal, the Better Block PSU program, and PSU's membership in PacTrans, the Pacific Northwest Transportation Consortium. Our continuing goal is to produce impactful research and tools for transportation decision makers, expand the diversity and capacity of the workforce, and engage students and professionals through education, seminars, and participation in research. To get updates about what's happening at TREC, sign up for our monthly newsletter or follow us on social media.