The right-turner actuated signal control strategy using the information of the presence of right-turning vehicles on the stretch of approach has been proposed as a method of solving the problems in the conventional strategy using a spot sensor (ultrasonic type vehicle detector). An image processing vehicle detector was actually installed and the field experiments of the proposed strategy were performed. The purpose was to examine quantitatively the improvement of the control efficiency yielded from the new method as well as to clarify to what extent is it possible to solve the problems in the conventional actuation method. And hence the experiments were in the form of a comparison between the existing method and the new method. As the results it was found that all the problems in the existing method could be solved by the new method and that the increase in right-turn traffic capacity could be expected. The experiments were conducted as a part of the activities of the Universal Traffic Management Society of Japan (UTMS).
Abstract