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Ramp Metering

What Is Ramp Metering?

The Highways Agency is continually looking at ways of keeping motorways and trunk roads running smoothly.  Ramp metering is a key measure for reducing delays at junctions.  It works by managing the traffic on slip roads.  During busy periods, signals release just a few vehicles at a time.  This prevents merging and mainline traffic from bunching together and creating a bottleneck which delays everyone.

By preventing or delaying flow breakdown the system provides the following benefits:

  • Greater throughput during peak periods;
  • Less congestion and improved traffic flows;
  • Smoother and more reliable journey times;

The ramp metering system uses signals on the slip road which come into operation when traffic sensors on the main carriageway indicate heavy traffic.  Traffic conditions are monitored and signal timings are constantly updated.  The system also watches the slip road to ensure queues do not back up onto local roads.