Performance Assessment of Highway Tunnel Surveillance and Control System by Fault Tree Analysis

As the typical application of intelligent transportation system (ITS), highway tunnel surveillance and control system (HTSCS) is the critical system to improving the transportation safety and efficiency of highway tunnel. In this paper, a HTSCS performance assessment model which employs failure rate (probability of top events) as the performance index based on fault tree analysis (FTA) method is presented. Based on this, the performance assessment procedure, the cause and probability of HTSCS failures are provided, and subsequently some advice on the improvement of HTSCS performance is given. The presented model can also be applied in the maintenance of HTSCS, which can provide feasible program for the location of system faults, and thus reduce the workload of fault diagnosis, improve the maintenance efficiency of HTSCS.