Abstract
The roughness of the road surface affects not only riding comfort but also handle operating. Authors have fixed their eyes upon the road surface conditions reflecting the relative position of vehicle wheels, and have developed a new index named “WONDERING INDEX (WI) ” which represent road surface conditions.
This paper describes relations between WI and handle operating works, and investigates how to measure road surface conditions reflecting the relative position of vehicle wheels. The results show that WI and handle operating works have a high mutual relation. Consequently, it is concluded that WI can be a useful index to evaluate the road surface that affect handle operating.
