The safety and efficiency characteristics of the road network depend largely on the operation of the intersections, particularly in the urban areas. It is here that the majority of vehicle and pedestrian conflicts occur, manifesting in accidents and delays. Therefore, it is imperative that the most appropriate decisions of intersection type, design and control are made when intersection improvements or new construction are being programmed. This paper firstly discusses New Zealand's road safety statistics over recent years and compares them with similarly motorised countries. Also discussed are recent initiatives undertaken to provide safer roads. A significant proportion of accidents in New Zealand occur at intersections, consequently any initiatives that can be taken to reduce accidents at intersections has major social and economic benefits and incentives. Secondly, the paper briefly outlines expert systems and the development of a software package, utilising artificial intelligence technology, that will determine intersection treatment and control. The expert system will firstly determine the appropriate form of treatment and control from the four main intersection categories, taking into account safety, capacity and other important factors. The expert system has the potential to save considerable professional time and effort. (A)
Abstract