This paper introduces the studies and applications on the design of unsignalised intersections in Japan. First, current road traffic conditions are briefly explained. Standards and guidelines on highway design, as well as current work at research organisations are mentioned. Second, traffic signal warrants are introduced, although no authorised standards currently exist in Japan. Major intersections are assumed to be signalised because the decision to install traffic lights is based primarily on congestion or accident history rather than on an engineering estimate of intersection capacity. Guidelines for estimating capacity at unsignalised intersections, stop-controlled intersections, and rotaries are also discussed, and the estimation techniques are summarised. Safety characteristics of unsignalised intersections and typical accident types experienced in Japan are explained using an overview of current accident statistics. Finally, recent and ongoing road traffic studies are briefly discussed. (A)
Samenvatting