Development of Standards for Streetlight Illuminance for Realizing Safe Living Environment Based on Cooperation with Residents

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Street illuminance at nighttime is an important factor to control the safety of residential area. We and members of residents' associations measured the illuminance at every 10m on streets and the members performed subjective assessment of brightness at each point in five residential areas. We analyzed histograms using the data and examined streetlight illuminance standards. Through case studies of the residents' association of two areas, we examined a method to extract points where streetlights should be improved based on residents' answers of questionnaire concerning frequency of utilization and feeling of scared on each street in the areas and data of measured illuminanance at nighttime at every 10m on streets in the areas.