Does Array Pattern of Speed Reduction Markings Need to Be Changed in Accordance with Horizontal Curve Radius?: Causality Analysis Using Driving Simulator Data

抄録

Based on causality analysis using driving simulator data, this study analyzes the effectiveness of speed reduction markings installed in the straight lane approaching transition curve section on the road. Focusing on the spacing pattern of transverse marking lines constituting the speed reduction markings, which is referred to as an array pattern, this study assumes that linear deceleration rates of the vehicle before an arbitrary cutoff point placed experimentally on the straight lane do not differ between the reduced spacing pattern and constant spacing pattern. By performing a difference-in-differences analysis using panel data, it is pointed out that there is a significant difference between both rates after the cutoff point. Finally, it is concluded that the reduced spacing pattern needs to be changed when the horizontal curve radius changes, except in the case that drivers approaches the curve with the speed close to the design speed of the curve.