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Ramp Metering System in North Rhine-Westphalia Home > Projects > Ramp Metering System NRW Project Conception The signal light installation of the ramp metering system is switched off as long as the traffic flows unhindered on the main road. Measurement loops monitor the traffic flow. As soon as the traffic density reaches a threshold value, ramp metering and signal light installation are activated. Algorithms calculate from the current traffic data the optimal parameters for the signal head control. The time for the "red phases" for the oncoming traffic is regulated according to traffic density. In order to avoid greater gisturbances on the main lane of the motorway, only one vehicle at a time is allowed to pass the ramp metering installation during the green phase. This is realised by a fast reaction upon loop impulse and by short yellow phases. Goals are: Improvement of traffic flow Decrease of congestions and accidents Increase of average speed in dense traffic Better use of motorway capacity System Characteristics of 8 Projects 129 Road stations Measurement cross-sections with inductive loops on motorway and ramps 73 Ramp metering installations 54 Prism openers on the accessing roads, partly controlled via radio signals Realisation Weiss-Electronic GmbH started with these ramp metering systems in 2001. According to TLS 2002 standard, only Weiss-Electronic ramp metering systems have been installed in Germany up to now. The commission's total until today amounts to approx. € 7.8 millions. Detail view

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