Journal Article Modeling pedestrian crossing speed profiles considering speed changebehavior for the safety assessment of signalized intersections

IRYO-ASANO, Miho  ,  ALHAJYASEEN, Wael K. M.

108pp.332 - 342 , 2017-11 , Elsevier
ISSN:0001-4575
Description
Pedestrian safety is one of the most challenging issues in road networks. Understanding how pedestriansmaneuver across an intersection is the key to applying countermeasures against traffic crashes. It is known thatthe behaviors of pedestrians at signalized crosswalks are significantly different from those in ordinary walkingspaces, and they are highly influenced by signal indication, potential conflicts with vehicles, and intersectiongeometries. One of the most important characteristics of pedestrian behavior at crosswalks is the possible suddenspeed change while crossing. Such sudden behavioral change may not be expected by conflicting vehicles, whichmay lead to hazardous situations. This study aims to quantitatively model the sudden speed changes of pedestriansas they cross signalized crosswalks under uncongested conditions. Pedestrian speed profiles are collectedfrom empirical data and speed change events are extracted assuming that the speed profiles are stepwisefunctions. The occurrence of speed change events is described by a discrete choice model as a function of thenecessary walking speed to complete crossing before the red interval ends, current speed, and the presence ofturning vehicles in the conflict area. The amount of speed change before and after the event is modeled usingregression analysis. A Monte Carlo simulation is applied for the entire speed profile of the pedestrians. Theresults show that the model can represent the pedestrian travel time distribution more accurately than theconstant speed model.
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