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Precursor Systems Analyses of Automated Highway Systems Resource Materials AHS Safety Issues
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1994-11-01
[PDF-2.47 MB]
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Abstract:The safety objective for an AHS is to design a driving environment that is collision-free under normal operating conditions. This task requires the identification of the issues involved in achieving a collision-free environment, and the risks associated with failure to meet this objective. Our analysis approach is based on the AHS concept as a major enhancement to the existing roadway system. Therefore, the experience acquired, lessons learned, and insights gained during the last 40 years of interstate highway operations is a benefit to the AHS concept analysis. This experience, coupled with our knowledge of vehicle and roadway safety is used to provide design guidelines for an AHS. Lastly, we interpreted the accident analysis results as a means of defining the potential AHS benefits. Our technical approach was to focus on specific system features and driver functions associated with the Representative Systems Configurations (RSCs) defined in Volume I, PSA of AHS Overview Report, section 3.0. The six general RSCs, independent of vehicle type, were used. From this perspective, two questions were answered. The first question, “What could go wrong?”, was addressed by a Fault Hazard Analysis (FHA) of AHS operations for each general RSC. The second question, “If something does go wrong, what are the consequences?” was answered using statistical accident data bases. The assumptions for this analysis are addressed in section 1.2.
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