Abstract
The report reviews, synthesizes and interprets the impacts and costs of urban traffic control system improvements. Four major categories of control system improvements are covered : coordination of traffic signals; optimization of traffic signal timing; advanced computer-based master control systems; and freeway traffic management systems. Project level impacts and areawide impacts are given for various types of traffic control projects and comprehensive combined programs. Also discussed are current implementation status of the different types of traffic control improvements, institutional impediments, and cost effectiveness. Special treatment is given to the impacts of improved traffic control on energy consumption. (Author/publisher)