交通优先基本理解.ppt

Basic Understandings forTransit Priority TRB SCP Seminar January 13, 2002 Paul R. Olson, P.E. PTOE FHWA Western Resource Center What Systems Preemption Request SHALL be serviced. Only one request serviced at a time All other signal operations temporarily suspended Special signal control program takes control until preemption call is terminated. Some preemption calls trump others. Priority Service not guaranteed May service simultaneous requests Minimize delay for special vehicles Only limited adjustments are made to signal operations Vehicle Class may determine how request is serviced Signal Operations Events in Priority Logical System Model Priority Request Generator Priority Request Server Details Signal Timing Point Detection Zone Detection Continuous Detection Queue Dynamics? Conclusion Need agreement on basic principals * (Service Cancellation) Service Commitment Monitor Initiate Service Preparation TSD Start of Service Service Completion Monitor TED End of Service Recover Request Received time time Events Service Intervals Gardner Systems Transportation Systems Engineering