Safety evaluation of urban transit signal system based on the improved TOPIS

AbstractSafety evaluation is one of the most effective countermeasures to improve the safety in modern urban transit system. This paper now applies that method to get the order preference of safety in all fault modes in a urban transit signal system using TOPIS based entropy weight for safety evaluation. TOPSIS is based on the concept that the chosen alternative should have the shortest distance from the positive ideal solution (PIS) and the farthest distance from the negative ideal solution (NIS). Entropy weight is ascertained by entropy theory, and the subjectivity in ascertaining the weights of more factors in lower hierarchy is avoided. The evaluation result indicates that this method is easy and can be implemented as an effective method in safety evaluation of urban transit signal system