Levinson, David MChen, Wei2016-05-022016-05-022004Levinson, David and Wei Chen (2004) Traffic Management Systems. (263-286) in Assessing the Benefits and Costs of Intelligent Transportation Systems (ed. David Gillen and David Levinson) Kluwer Publishers.https://hdl.handle.net/11299/179919This study uses regression analysis to evaluate long-run traffic management system performance. Three important traffic management systems in the Twin Cities metro area - Ramp Metering, Variable Message Signs (VMS), and Freeway Service Patrol (the Highway Helper Program) were evaluated with multiple regression models to predict link speed and incident rate. We find that ramp meters increase freeway link speed and reduce incident rate. Freeway Service Patrols increase link speed when incidents are present. The results for variable message signs are ambiguous.enTraffic management system; Traffic system performance; Before-and-after study; Ramp Metering System; Variable Message Signs (VMS); Freeway Service Patrol; Highway Helper Program.Article