||Voorhees (Alan M.) and Associates, Inc., McLean, VA.;Urban Mass Transportation Administration, Washington, DC. Office of Policy and Program Development.;Federal Highway Administration, Washington, DC. Office of Highway Planning.;Environmental Protection Agency, Washington, DC. Office of Transportation and Land Use Policy.
Transportation Systems Management (TSM) actions include a wide range of transportation improvements, from basic traffic engineering to a variety of transit improvements, parking strategies, and pricing policies. Under Department of Transportation (DOT) regulations, urban areas with populations greater than 50,000, are required to develop TSM plans that document their strategy for improving air quality, conserving energy, and increasing the efficiency of the overall transportation system. This report summarizes interim results of research designed to quantify the impacts that TSM actions have on the system. Through the research methodology, all TSM actions are divided into four classes according to their impact on transportation supply and travel demand. The classes are: Class A - Demand Reduced; Class B - Supply Increased; Class C - Demand Reduced and Supply Reduced; and Class D - Demand Reduced and Supply Increased. For each of these classes, computations are performed to determine how a major multi-year program applying these actions would affect the area's vehicle miles traveled and vehicle hours traveled. The results will serve to help local areas in developing appropriate transportation measures for use in local TSM plans as required by DOT regulations and the State Implementation Plans (SIPs), as mandated by the Environmental Protection Agency (EPA) pursuant to the Clean Air Act. This document contains working papers which describe experience with and the impacts of some of the major TSM actions. These include impacts of ridesharing, routes and scheduling, Park-and-Ride and express bus, work rescheduling, and auto restricted zones. The Appendix: A Supply-Demand Approach to TSM, explains the development of the methodology that led to the findings in this report.