Depending on the local situation of traffic demand, environmental boundaries, historical situations or political decisions, ramp metering systems can be modified by adding or removing solely abilities
Nevertheless, there were many invented algorithms; such as the ALINEA developed in France in 1990, which is even today a commonly used local ramp metering algorithm.
The deployment and development of ramp metering systems in Europe started in England in 1986 and continued in the Netherlands in 1989