• A Lot of major cities have Ramp Meters to help control congestion on highways. With Austin growing at the rate it is and especially with our growing traffic issues we could use all the help we can get. Ramp Meters also known as a Ramp Signal or Metering Lights is a device similar to traffic lights that control the merging traffic onto highways by spacing out the number of cars that merge, lessening the density on IH 35 and improving the flow of traffic.