Principles of Quality Management for Traffic Signals in Japan

Nowadays, many cities face increasing traffic demand and in conclusion, traffic congestion often becomes chronic and traffic accidents accumulate. One of the main instruments to control the traffic in the road network are traffic signals and they are established to cope with these problems. However, traffic signals are subject to changing requirements and conflicts of goals. In addition, questions arise regarding the establishment of a quality management system following the example of manufacturing and service processes. In this context, the thesis compares the principles of quality management for traffic signals between Japan and Germany in a comprehensive way.