The influence of vertical illuminance on pedestrian visibility
This project investigated the required lighting levels for crosswalk illumination. The current European methods for lighting suggest a crosswalk lighting level of 40 vertical lux for ensured safety. The primary question studied: Can the required vertical illuminance level for adequate pedestrian visibility and the selection of an object act as a surrogate for the pedestrian?The vertical illuminance was determined from an experiment that measured the visibility of pedestrians at lighting levels of 5, 20, 40, and 60 vertical lux. During the experiment, a crosswalk scene was presented to participants and the time taken for identification was measured. In addition to the lighting level, the conditions used in the experiment were lamp type (metal halide versus high pressure sodium), the presence of glare and the use of overhead lighting and pedestrian clothing (white, black, and denim). The study found that a lighting design level of 20 vertical lux is most likely adequate for proper pedestrian visibility. Except in selected cases, the lamp type was not significant. The impact of glare was not influenced by the lighting design.
Pedestrian Visibility Vertical Illuminance Crosswalks
Gibbons, Ronald B.
Virginia Tech Transportation Institute
国际会议
26th Session of the CIE(国际照明委员会（CIE）第26届大会)
北京
英文
815-818
2007-07-04（万方平台首次上网日期，不代表论文的发表时间）