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This report presents the methodology and results of the independent
evaluation of a prototype integrated crash warning system for light
vehicles as part of the Integrated Vehicle-Based Safety Systems
initiative of the United States Department of Transportation's
Intelligent Transportation System program. The system integrates
rear-end crash, curve-speed warning, lane change crash, and lane
departure warning functions. The goals of the independent
evaluation are to assess the safety impact, gauge driver
acceptance, and characterize the capability of the integrated
safety system. The evaluation is based on naturalistic driving data
collected from a field operational test using 108 subjects who
drove 16 passenger vehicles equipped with a prototype integrated
safety system and a data acquisition system. The test subjects
accumulated over 213,000 miles during a 12-month period throughout
parts of southeast Michigan. For each driver, the test period was
divided into a 12 day baseline condition with the system disabled
and a 28 day treatment condition with the system enabled to compare
the effect of the system on driving performance. The results of the
analysis suggest that driving with the integrated safety system
improves driver behavior and increases driver safety, that drivers
feel that the system provides a safety benefit, and that the system
alerts had a high degree of accuracy. This report delineates the
methodology of the different analyses and discusses their results.
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