Abstract
There is a lot of complicated moving of the vehicles in the front of roadside shop entrance. In this paper, we focused on the traffic accidents on the roadside shop entrances. We firstly estimated the number of traffic accidents on such places by police traffic accident data in Japan. In this data, there is no code to handle the traffic accident place. We set the procedure to identify accident place on the front of the roadside shop. Secondly, variation trees are made to identify the affected factors for the human decision error on some traffic accidents in Tsukuba city.
