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http://dx.doi.org/10.7470/jkst.2015.33.4.323

Methodology for Calculating Surrogate Safety Measure by Using Vehicular Trajectory and Its Application  

PARK, Seongyong (Department of Road Transport Research, The Korea Transport Institute)
LEE, Chungwon (Department of Civil and Environmental Engineering, Seoul National University)
KHO, Seung-Young (Department of Civil and Environmental Engineering, Seoul National University)
LEE, Yong-Gwan (Institute of Construction and Environment Engineering, Seoul National University)
Publication Information
Journal of Korean Society of Transportation / v.33, no.4, 2015 , pp. 323-336 More about this Journal
Abstract
Estimating the risks on the roadway using surrogate safety measures (SSM) has an advantage in that it focuses on the vehicle trajectory directly involved in conflicts. On the other hand, there is a restriction on estimating the risks of continuous segments due to the limited data collected from a location. To overcome the restriction, this study presents the scheme of acquiring the vehicular trajectory using real time kinematics-differential global positioning system (RTK-DGPS) and develops a methodology which contains the considerations of the problems to calculate the SSM such as time-to-collision (TTC), deceleration rate to avoid collision (DRAC) and acceleration noise (AN). By using the methodology, this study shows a result from an experiment executed in a section where the variation of vehicular movement can be observed from several continuous flow roadway sections near Seoul and Gyeonggi Province in Korea. The result illustrated the risks on the roadway by the SSM metrics in certain situations like merging and diverging, stop-and-go, and weaving. This study would be applied to relate the dangers with characteristics of drivers and roadway sections, and prevenst accidents or conflicts by detecting dangerous roadway sections and drivers' behaviors. This study contributes to improving roadway safety and reducing car-accidents.
Keywords
acceleration noise; deceleration rate; RTK-DGPS; surrogate safety measure; time-to-collision; vehicle trajectory;
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