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原文传递 TRANSPORTATION INFRASTRUCTURE: BENEFITS OF TRAFFIC CONTROL SIGNAL SYSTEMS ARE NOT BEING FULLY REALIZED.

题名：	TRANSPORTATION INFRASTRUCTURE: BENEFITS OF TRAFFIC CONTROL SIGNAL SYSTEMS ARE NOT BEING FULLY REALIZED.
关键词：	TRAFFIC-SIGNALS; TRAFFIC-CONGESTION; REDUCTION-DECREASE; IMPLEMENTATION-; OPERATION-AND-MAINTENANCE; INTELLIGENT-VEHICLE-HIGHWAY-SYSTEMS; FEDERAL-HIGHWAY-ADMINISTRATION; STATE-GOVERNMENT; LOCAL-GOVERNMENTS; BENEFITS-; TRAFFIC-SIGNAL-TIMING; ACCIDENT-REDUCTION; TRAVEL-TIME; FUEL-CONSUMPTION; AIR-POLLUTION; EFFECTIVENESS-
摘要：	The General Accounting Office (GAO) evaluated federal, state, and local efforts to use traffic control signal systems to reduce congestion. Specifically, GAO examined (1) the benefits of traffic control signal systems; (2) the problems that state and local agencies face in implementing, operating, and maintaining effective signal systems; (3) the relationship of the current signal systems to emerging technologies like Intelligent Vehicle/Highway Systems (IVHS); and (4) the role of the Federal Highway Administration (FHWA) in assisting state and local governments with their signal systems through reviews of plans and other means. GAO also looked at related issues that can affect the operation of traffic control signal systems, such as left and right turns on red signals and the practice of running red signals. Briefly, GAO found the following: Studies have consistently reported substantial benefits when localities have installed new traffic control signal systems and upgraded or changed the timing of existing systems. These benefits include reducing accidents, congestion, travel time, fuel consumption, and air pollutants. Signal systems provide optimum benefits only when they are properly designed, operated, and maintained. However, states and localities have experienced problems in these areas that have had an impact on the effectiveness of their systems. While these problems are preventing the achievement of optimum results today, the implications for the future may even be greater because of the limitations these problems place on new technologies such as the emerging IVHS technologies. FHWA headquarters and the regions and divisions GAO visited are inconsistent in their approach in reviewing state and local governments' operations plans for signal systems and otherwise offering assistance. The FHWA reported in 1990 that it had insufficient technical expertise at all levels to assist state and local governments with their traffic control signal systems. This situation has not significantly improved.
总页数：	1994/03. pp33 (1 Fig., 5 App.)
报告类型：	科技报告