The perceptual performance of horizontal space judgment for novice and experienced drivers is investigated. Two of poles were used for the space judgment. The judgment tasks involved the evaluation of three different pole spacings at two separate distances. The drivers were required to judge the possibility of negotiating between the poles.
When the drivers were positioned at a long distance from the visual objective, their space judgment between poles was narrower than that when they were positioned at a short distance. When the judgment object was placed at a short distance, the novice drivers tended to judge the space narrower than the experienced drivers. Furthermore, the response time of judgment for the novice drivers whose skill progress speed was slow, became long when the judgment object was placed at a long distance.