The effects of traffic control devices and road scene on a driver's judgement of curve sharpness were investigated by field experiments on a 12-km section of rural highway running through a hilly area in Hokkaido, Japan. The configurations of traffic control devices at 36 curves were obtained from the road maintenance database. The favourability of the road scene was determined subjectively. Each of the 6 subjects drove a vehicle installed with instruments. The subject estimated the sharpness of the target curve before that curve and assessed the accuracy of that judgement subjectively after the target curve. Cluster analysis detected groupings of the 36 curves in terms of driver assessment of sharpness. The traffic control devices were verified as important cues in driver assessment of curve sharpness. In addition, the road scene had a positive effect in daytime on judgement of the target curve. However, there were some dangerous curves where the subjects underestimated the sharpness before entering the curve. Traffic control devices to provide accurate information on curve depth should be developed.
Samenvatting