Samenvatting
Traffic signal research and development in the united kingdom (ham,r and robertson,d); existing and recommended practices for traffic signal visibility in the usa (leiser,cf and parker,h); experiments with an adaptive control policy for oversaturated critical intersections (ikenoue,k, nakamura,k and miyasako,t); traffic signals in brazil (goncalves,jel). for the covering abstract of the conference see IRRD 275170.