The use of red arrows at signalised intersections to separate pedestrians and turning vehicles in time has been investigated. The option that is normally used in Australia to resolve potential conflict at an intersection, is to provide signals for pedestrians and vehicles and to require turning vehicles to give way to pedestrians on the crossing (designated option (e)). Another option is to provide separate phases for conflicting pedestrian and vehicular streams. In a variant of this, designated option f-2, vehicles are not permitted to proceed during the walk period but can during the clearance period provided they give way to any pedestrian. This paper is an investigation of when option f-2 should be used rather than e from the viewpoint of highway intersection capacity and delay. Data from three Brisbane intersections were analysed with the computer program SIDRA, and the effects of changing the signal timing plan from e to f-2 were estimated. Video was used also. From these results, guidelines are developed for inclusion of a red arrow with turning vehicles in terms of numbers of pedestrians and vehicles using the intersection. (A)
Abstract