Abstract
This study analyzes evaluation of drivers’ detection distance according to the local lightings condition of crosswalk illumination whichcan be installed with or without the continuous lightings; here, continuous lightings mean the lightings installed with a regular spac-ing along the roadside of two lanes and four lanes. The study facilities dummy-detection-distance as a measure of effects observedaccording to the varying lighting conditions; day-time, night-time with continuous lightings only, night-time with the combination ofcontinuous lightings and crosswalk lightings, night-time without lightings at all, and night-time with crosswalk lightings only. Adummy was installed to mimic the school-age-child who are 110 cm tall about to cross the road at crosswalk. Field test was carriedout at two places; one is four lanes operated roads with the continuous lightings and the other is two lanes operated roads without thecontinuous. The corresponding limited speeds are 70 and 60 kph, respectively. With the data of 15th percentile dummy-detection-dis-tance for four lanes operated roads, we conclude the distance for continuous lightings only was not satisfying the Stopping Sight Dis-tance required at 70 kph design speed. The distance was increased with the order of combination of continuous lightings andcrosswalk lightings, day-time condition, and continuous lightings only. With the same data analysis for two lanes operated roads, weconclude the distance for day-time condition only satisfy the Stopping Sight Distance required at 60 kph design speed. Especially, theaverage, 85% tile, 50% tile, 15% tile of a no-night-time lighting (street lamps off) were determined that the subject detection distancewas very shorter than Stopping Sight Distance. Therefore, this insufficient sight distance could make heighten the possibility of accident.Key words : Road Safety, Street Lightings, Crosswalk, Visibility Distance, Stopping Sight Distance
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