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Riyadh city is one of the most traffic congested cities in the Arab world, due to development and expansion in infrastructure, urban and economic growth which has led to increasing demand of transport, therefore the intervene is becoming necessary to reduce the problem of traffic congestion in a city through the implementation of intelligent transportation systems in highways. One of the applications of this system is ramp metering. Vehicle access to the freeway without restrictions is one of the causes of traffic congestion. Ramp metering organizes and breaks up of vehicle platoons that merge onto the freeway by a traffic signal at the entrances of the freeway and is controlled it in several ways. It has been applied in America, Europe, and East Asia and has had a great effectiveness in reducing traffic congestion, especially at peak hours.