The role frontal motorcycle conspicuity has in road accidents

Since motorcyclists are over-involved in accidents, it is of some importance to determine whether or not the use of headlights during daylight might lead to a reduction in such accidents. While some U.S. states have laws in this regard, and other places including Australia have recommendations that such a policy become law, a study was made to help a decision as to whether or not the policy should be introduced into New Zealand. Studies reviewed included those of accident characteristics, those concerning daylight running-light use on automobiles, and those involving day time light use on motorcycles. Physiological and psychological reasons for conspieuity (or lack thereof) of an object are also reviewed, as are factors affecting perceptual processes. It is concluded that compulsory usage of motorcycle headlights should be favored and that New Zealand is very likely to have a benefit-cost ratio exceeding l if such a policy is adopted.