Abstract
Autonomous vehicles will be used in public roads in the near future. However, it seems difficult for autonomous vehicles to turn right within urban areas. In addition, there are many traffic accidents when the right turn is made. The right turn regulation may be useful, but it reduces the efficiency of traveling. The aim of this paper is to analyze how much the no right turn regulation increases the average travel distances between the origin and destination points where they are uniformly and independently distributed along the grid streets. We compare the results with the average distance traveled.