The purpose of this research is to clarify how oncoming pedestrians behave as to avoid a stranger on the nigttime street. As a result of observational research of walk behavior, it has been found that pedestrians tend to avert the stranger more quickly at nighttime compared to daytime, and the distance pedestrians leave between the stranger becomes greater when the stranger is standing at a dark side of the street. Moreover, it has also been found that pedestrians have the tendency to avoid the stranger in places that are not well illuminated, and that they tend to walk toward a place where it is well illuminated after crossing the stranger.
