This report presents the data and findings from the on-scene, in-depth investigations of 900 motorcycle accidents and the analysis of 3600 traffic accident reports of motorcycle accidents in the same study area. Comprehensive data were collected and synthesized for these accidents to cover all details of environmental, vehicle and human factors. In addition, exposure data were collected and analyzed at 505 accident sites at the same time-of-day, same day-of-week, with same environmental conditions. These exposure data define the population at risk so that comparison with accident data will reveal the factors which are over-represented in the accident population.

The analysis and review of these data identify cause factors of motorcycle accidents, relates the effectiveness of safety equipment and protective devices, and identifies countermeasures for accident and injury prevention.

Volume I is the Technical Report containing the most significant data, data analysis, findings, conclusions and recommended countermeasures.

Volume II is the Appendix with terminology, field data forms, ana supplemental data and analysis.