First Published in 1989. Routledge is an imprint of Taylor & Francis, an informa company.

Printed on Demand. Limited stock is held for this title. If you would like to order 30 copies or more please contact [email protected] Contact [email protected], if currently unavailable. This paper is part of a four-volume series of publications on rural transport promoted by the World Bank's Rural Transport Thematic Group under the aegis of its knowledge management activities. The four volumes are Options for Managing and Financing Rural Transport Infrastructure, Improving Rural Mobility, Developing Rural Transport Policies and Strategies, and this paper on Design and Appraisal of Rural Transport Infrastructure.

This handbook, which was developed in recognition of the need for the compilation and dissemination of information on advanced traffic control systems, presents the basic principles for the planning, design, and implementation of such systems for urban streets and freeways. The presentation concept and organization of this handbook is developed from the viewpoint of systems engineering. Traffic control studies are described, and traffic control and surveillance concepts are reviewed. Hardware components are outlined, and computer concepts, and communication concepts are stated. Local and central controllers are described, as well as display, television and driver information systems. Available systems technology and candidate system definition, evaluation and implementation are also covered. The management of traffic control systems is discussed.

TRB's National Cooperative Highway Research Program (NCHRP) Report 672: Roundabouts: An Informational Guide - Second Edition explores the planning, design, construction, maintenance, and operation of roundabouts. The report also addresses issues that may be useful in helping to explain the trade-offs associated with roundabouts. This report updates the U.S. Federal Highway Administration's Roundabouts: An Informational Guide, based on experience gained in the United States since that guide was published in 2000.

Expectancy relates to a driver's readiness to respond to situations, events, and information in predictable and successful ways. This report describes the concept of driver expectancy in the context of the driving task, and provides examples of expectancy and expectancy violations. It includes a procedure for identifying general and specific expectancy violations to enable engineers to develop remedial treatments to deal with expectancy problems.