Detailed Driver Behaviour Analysis and Trajectory Interpretationat Roundabouts using Computer Vision Data (original) (raw)
With recent and important upgrades to North American intersection design guides, roundabouts are gaining popularity as a method of reducing road conflicts, streamlining flow, and curbing excessive speeding of busy intersections. The current design approach, however, makes use of spot-mean speed measures and design criteria which do not take into account yielding behaviour and acceleration/deceleration which may be affected by regional driving culture and local roundabout design. This research paper introduces the methodology being developed for the detailed analysis of driving behaviour, trajectory interpretation, and conflict measures in modern North American roundabouts from video data extracted by means of computer vision. The analysis explores the methods used to prepare microscopic speed maps, compiled speed profiles, lane-change counts, and gap time measures. It also introduces and discusses the interpretation of trajectories at the scale of roundabout merge sections instead of looking at safety from the point of view of a roundabout as a unified system. The research finds significant variation in distributions of speed across five case study roundabouts in the province of Québec, Canada, which may be explained by regional differences in design and road use. It also reports aggressive gap times and uneven traffic flow as a contributing factor to speed.
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