Abstract
Three research projects have been undertaken to design a system of optimal freeway control. The projects studied the John Lodge Freeway in Detroit, the Eisenhower Expressway in Chicago, and the Gulf Freeway in Houston. Each project has met with a certain degree of success, although each has developed a different control strategy. The one common factor among these projects is the concept that, in order to relieve Freeway congestion, the rate of entry of vehicles from the...