Abstract
Right turn at the intersection is one of the difficult conditions for drivers to recognize and judge the situation. Especially in night time there are less information, so mistakes in recognition are thought to be the reason for accidents. The quantitative evaluation method concerning right turn has been investigated. Supplementary lights mounted on a vehicle and their effects have been measured. The results show that the higher luminosity of supplementary lights on the oncoming car gives the drivers the more safety margin in their judgment on starting turning right. Accordingly the supplementary lights are expected to make drivers' right turn behavior safer in real world condition.