Ramp metering is a strategy used to regulate the volume of vehicles entering a freeway at a given time there by seeking optimal freeway operations. Its Access to the freeway is controlled using a traffic signal that is powered by an algorithm that uses real-time system traffic data to determine the rate at which vehicles should enter the freeway. When a cars try to merge onto a highway or freeway the cars already there have to slow down to allow them in. Ramps aid in this issue because they regulate traffic flow. Without ramp meters there could easily be more traffic congestion.