This third edition of the late R.J. Salter's successful book has been revised and updated by N.B. Hounsell. Part I covers transportation planning, incorporating new methodological approaches and models. Part II covers highway traffic analysis and design, including updated sections on link and junction design, together with new computer aided design packages. Part III concentrates in traffic signals, with new chapters on microprocessor-based signal control and modern urban traffic control systems. This new edition consolidates the book's position as a practical text of traffic theory and practice, including many worked examples, for undergraduate and postgraduate students of transport and traffic engineering.