Abstract
A driver is loaded psychologically and physiologically by the moving cars and the cars parked at the side of road that comes into the front view. Thus, the driver is subjected to mental stress which depends on the change of obstacles above mentioned, and the stress usually causes a change in the physiological conditions of driver. The traffic accidents are caused when these influences put a lot of stress on a driver. From this stand point this paper examines relations between the road traffic condition and the driver's psychological and physiological responses by using the driver's field of vision and sweating.