Traffic signal is one of the most important tools for urban traffic control.The maintenance of signal in correct and normal operations is a veryimportant task. By participating signal break-down repair work, this studyconcludes two approaches to
maintain the normal signal performance:1. the planning and operations of break-down repair; 2. the proactivemaintenance and break-down prevention. This study set the goal to studyplanning strategy for break-down repair. According to the former issue,
taking the objectives into accunt 1. to minimize influence on level oftravel service, and 2. to minimize cost of repair , this study expectsto repair signal break-down repair through appropriate planning.According to the description of aforementioned the repair routing modeland the related solution for signal break-down repair is developed.This study considers the fact traffic order and road users is ostlythreatened when signal at an important intersection is out of order,and thus suggests higher weight for important intersection.
