Analysis of Selective Conflicts between Multiple Bicycles and Left-Turning Vehicle at Signalized Intersections by using Video Tracking Data

The characteristics of dangerous conflicting patterns caused by multiple bicycles entering simultaneously at the corner of a signalized intersection with two-way bicycle traffic were clarified through an observational survey and video-tracking analysis using the Time to Collision index.

As a bicycle traffic pattern that is overlooked by drivers of left-turning vehicles, the number of cases is clearly higher for forward traffic than for oncoming traffic, and countermeasures against so-called left-hook collisions should be considered.

The most dangerous bicycle traffic pattern was when two bicycles enter different crossing points at the same time, especially in the case of short-cut bicycle through the nearside of the intersection corner.