In this study, with the overall goal object to determine the desired field of view for motorcycle rear-view mirrors, we examined the role of the direct rearward field of view by head check and the role ofthe indirect rearward field ofview by mirror check. The following three research items were selected:
- Head check duration and frequency, mirror check duration and frequency, category Judgment for the rearward field of view were obtained on actual roads using a test motorcycle with various rear-view mirror fields of view and a test car with typical rearview mirrors.
- The ratio by numberof riders who used the direct rearward field of view by head check was measured with a sample of riders in typical traffic situations, such as lane changes and lane merges, in which the rider needed rearward inforrnation.
- The limits of the direct rearward field of view by head check within which the rider could perceive a following car were measured.
As the results of these studies, we suggest considerations for performance requirements (required field of view) and design requirements (i.e. rear-view mirror curvature, size and mounting position) relating waiting to possible designs for motorcycle rear-view mirror field of view in the future period.