In this study, with a final objective of obtaining such data necessary for the international standardization of eye ranges of motorcycle riders in the future, we selected five different models of motorcycles (with engine capacities ranging from 250 cc class to 1,000 cc class) comprising four typical motorcycle types and measured the eye locations and riding positions of 456 Japanese and American motorcycle riders mounted on those motorcycles.

As a result, we found that when the shoulder location is adopted as the origin, four items-namely, distances between shoulder and handle grip, shoulder and hip, shoulder and eye, and the angle formed by the locations of eye, shoulder, and hip-are nearly constant, regardless of differences in vehicle frame dimensions. Therefore, the eye range of motorcycle riders can be located from the relative positions between the handle grip and hip point.

Furthermore, through comparison of anthropometric data between Europeans and Americans, the actually measured eye locations of American riders can be used as representing European riders' eye locations