HEAVY TRUCK RUN-OFF-ROAD COLLISION AVOIDANCE USING IVHS COUNTERMEASURES. TASK 1 FINAL INTERIM REPORT, VOLUME 1, TECHNICAL FINDINGS

The objective of the Run-off-Road Collision Avoidance Using IVHS Countermeasures program was to address the single vehicle crash problem by applying prevention and/or severity reduction technologies. This report extends work from the original Task 1 report by including heavy trucks. The report describes three analysis types that were applied: statistical analysis for estimating the problem size and establishing characteristics of the national crash population; 2) clinical analysis for determining crash causation factors and establishing the circumstances in which the crashes occurred; and, 3) engineering analyses for establishing the dynamic scenarios associated with each crash contained in the sample. The scenarios represented situation trees which delineated the specific combination of driver vehicle, and environmental factors in each crash and driver responses to critical events.