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Abstract ▼ AI-Helper

This study analyzes evaluation of drivers' detection distance according to the local lightings condition of crosswalk illumination which can be installed with or without the continuous lightings; here, continuous lightings mean the lightings installed with a regular spacing along the roadside of two...

This study analyzes evaluation of drivers' detection distance according to the local lightings condition of crosswalk illumination which can be installed with or without the continuous lightings; here, continuous lightings mean the lightings installed with a regular spacing along the roadside of two lanes and four lanes. The study facilities dummy-detection-distance as a measure of effects observed according to the varying lighting conditions; day-time, night-time with continuous lightings only, night-time with the combination of continuous lightings and crosswalk lightings, night-time without lightings at all, and night-time with crosswalk lightings only. A dummy was installed to mimic the school-age-child who are 110 cm tall about to cross the road at crosswalk. Field test was carried out at two places; one is four lanes operated roads with the continuous lightings and the other is two lanes operated roads without the continuous. The corresponding limited speeds are 70 and 60 kph, respectively. With the data of 15th percentile dummy-detection-distance for four lanes operated roads, we conclude the distance for continuous lightings only was not satisfying the Stopping Sight Distance required at 70 kph design speed. The distance was increased with the order of combination of continuous lightings and crosswalk lightings, day-time condition, and continuous lightings only. With the same data analysis for two lanes operated roads, we conclude the distance for day-time condition only satisfy the Stopping Sight Distance required at 60 kph design speed. Especially, the average, 85% tile, 50% tile, 15% tile of a no-night-time lighting (street lamps off) were determined that the subject detection distance was very shorter than Stopping Sight Distance. Therefore, this insufficient sight distance could make heighten the possibility of accident.

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