Citation

Son Y, Lee J, Yang CH. Proc. Road Saf. Four Continents Conf. 2007; 14: 10p.

Copyright

(Copyright © 2007, Conference Sponsor)

DOI

unavailable

PMID

unavailable

Abstract

When allocating traffic signal at the signalized intersection, minimum green time and clearance time for bicyclists should be significantly considered in order to enhance safety aspects to bicyclists when crossing intersections, especially where intersections with exclusive bicycle paths that are physically separated from pedestrians. In this study, field measurements related to bicycle crossing time, including minimum green time and clearance time, were collected and analyzed according to bicycles crossing types at the signalized intersections where high rate of bicyclists exists. Three types of bicycle crossing are defined as follows; 1) stopping: completely stop before crossing (at least one foot on ground) 2) riding: crossing with riding bicycle 3) pulling: crossing without riding bicycles. According to the results, two types of crossing such as stopping and pulling can be suggested as reliable sources for the estimation of minimum green time for bicyclists. Particularly, pulling is the most dominant type where bicycle paths are not physically separated from pedestrians. Minimum green time based on pedestrian speeds should be used as crossing time in this case. For bicyclists, speed of bicycle that is applicable to estimate the minimum green time is in the 1.36m/sec(15th percentile) to 1.60m/sec(25th percentile) range in case of its stopping. Also it is in the 0.75(15th percentile) to 0.87(25th percentile) range for pulling at crosswalk. In addition, speed of bicycle to consider for calculating the clearance time is in the 2.51m/sec(15th percentile) to 2.79m/sec(25th percentile). These values also resulted from 15th percentile or 25th percentile speeds of riding. The results of this study are expected to be supported in traffic signal allocation process, reflecting bicyclists' characteristics.