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Traffic management in cities

The traffic flows in cities are mainly controlled by traffic lights. Traffic lights are used to even out traffic flow and have the primary purpose of ensuring safe road traffic. This particularly applies to the weaker traffic participants.

Traffic light systems must be carefully designed, built and operated, as they directly interfere with the traffic flow by alternately stopping and releasing traffic flows with joint conflict areas. The Directives for Traffic Light Systems (RiLSA) serve as the main set of regulations for this purpose. They contain basic traffic engineering regulations and recommendations for the installation and operation of traffic light systems. New research findings, technical advances and updates of laws and road traffic regulations as well as other changing framework conditions are integrated into the Directives for Traffic Light Systems. The V5 section participates in the implementation of research projects as well as in the integration of new findings into the directives.

All participants are interested to increase traffic safety and the traffic flow in the long term. High-level quality assurance and quality management are required to ensure that traffic light systems can achieve this.

Quality management (QM) of traffic light systems has not been specified in detail in the RiLSA and has rather been neglected in practical applications. However, it has gained importance in recent years. The new RiLSA includes process steps and suggested measures for successful quality management.

Guidelines for quality assurance

The guidelines were developed to inspire the operators of traffic light systems to introduce and apply QM to these systems and to support these operators by providing them with practical and useful hints for performing this task efficiently. The guidelines are further intended to provide supporting arguments for financial and personnel requests. The guidelines are available for downloading.

Traffic control for environmental protection

The evaluation and control of air quality and adherence to limit values for various air pollutants has increased in importance during recent years. The immission protection authority responsible must provide clean air plans when these limit values are exceeded and action plans when there is a risk that these limits will be exceeded (Section 11, Part 4 of the 22nd Ordinance for the Implementation of the Federal Immission Protection Act - BlmSchV).
Legal and technical options - including traffic management - are to be used to adhere to these limits and thus protect the health of the residents. Intelligent traffic light controllers (traffic-adaptive controllers) are important in this context. Model-based controllers, which assess the changes in traffic demand online, are used to determine the number of stops and the level of emissions and immissions of particles and nitrogen oxides as a function of the control activities.