Abstract
An investigation based on human visual search functions was conducted into the causative factors of traffic accidents at clear intersections in rural areas. The results indicated that it is difficult for drivers to detect a vehicle travelling on a collision course because the vehicle remains in the same position in the driver's visual field. Two systems are introduced to assist drivers' visual searches. One system uses an image processing technique, and the other utilises DGPS (differential global positioning system) and IVC (inter-vehicle communications) techniques. This paper presents the development of the assistance system.