Abstract
At the present day the number of the traffic accidents caused by elderly drivers is continuously increasing. One of the causes for these traffic accidents is inappropriate driving operation during steering. One reason is the increment of motion when shifting hands on the steering wheel, another reason is a tendency to oversteering. This increment of steering motion is produced by a reduction of the range of motion at the joints, which is physical feature of elderly people. This paper investigates a correction of the steering motion to reduce the inappropriate operation, and suggests a method for the steering gear ratio to correct driving operation. Also, the effectiveness of the new steering system including the steering gear ratio calculated by this method is tested and evaluated.
