Graduate Thesis Or Dissertation
 

Evaluation of Setback Crosswalk to Mitigate Vehicle-Pedestrian Conflicts at Intersections

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/jm214x10n

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  • It is considered best practice when designing pedestrian access at intersections to provide two curb ramps at each street corner. In Oregon, there are many locations where long ramp runs cause curb ramps to be set back a significant distance from the apex of the intersection corner to meet this standard. Debate exists in the transportation community related to the safety of setback crosswalks. However, assumptions that setback crosswalks are less safe or safer are not based on empirical evidence. Previous research has focused on the impacts of intersection characteristics on intersection safety but there is a clear gap on the safety effects of setback crosswalks. Therefore, this research investigates the relationship between the setback crosswalks and intersection safety with the consideration of other intersection characteristics using a driving simulator. An experiment with 50 participants was conducted using the OSU Passenger Car Driving Simulator to study driver behaviors while approaching and turning at 24 virtual intersections with various combinations of experimental factors. Time-space measurements were used to study participants’ stop line speed, turning speed, and stopping position. Increasing crosswalk setback was found to reduce the probability of yielding, where higher speeds were observed. Also, a proportional relationship between turning speed and curb radii was found. Eye movement data were used to examine participants’ visual attention on the traffic signals, crosswalk placement, and pedestrians. Participants looked at the traffic signal more and allocated slightly more visual attention towards the crosswalk in scenarios with a setback crosswalk. Participants tend to look at the pedestrian less in the setback crosswalk configuration. Galvanic Skin Response of participants indicate their level of stress during the experiment. Higher stresses were found in scenarios without pedestrian and with larger radii. The research results provide valuable findings for transportation practitioners to consider when designing or reconstructing the intersections with setback crosswalks.
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  • Pending Publication
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  • 2022-06-05 to 2023-01-05

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