Ramp metering development in a UK context

The article discusses operational experience and assessment work during 2002/2003, in particular the approach to ramp metering now operating on the M6 motorway in the UK Midlands, and further work associated with the ramp metering business case. Ramp metering is a traffic control system which uses traffic signals on the entry slip road (or 'ramp') to control the traffic joining the motorway from the slip road.