Abstract
We have conducted research on the actual situation and verification experiments, focusing on the visibility and illuminance. Our research results show that the most common length of an installation interval of the street lighting is too long to meet Japanese standards of street lighting. The length interval is about 35 meters. We also found that only a part of the large city's illuminance level is able to meet the standards. The experiments were conducted under the experimental street environment using temporary street lighting. We measured the visibility and illuminance under two different installation interval lengths of the street lighting, which were 30 meters and 40 meters. In consequence, we observed that even when the street environment meets the standards, the standard's "effect of the illuminance" does not always get the desired effect.
