Abstract
This study investigates the situation when a driving car collides with another object such as a person suddenly appearing from either right or left side of the driver's viewing field: which side is slower to detect and the effect of surrounding objects on the driver's detection time. The results show that the driver's detection time delays only when an object appears from the far left side. Also, as the number of surrounding objects increases the detection of objects appearing from the far left side becomes increasingly difficult. From this result, we conclude that in terms of the collision probability the sudden appearing of objects further from a driving car can be more dangerous than the object appearing nearer to the car.