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Devising methods of design and construction to provide an effective road system suitable for the needs of tropical countries has proved difficult, and considerable research has been necessary to understand the nature of the materials available and the behaviour of the road structures themselves. This book has been written on behalf of the Overseas Centre of TRL to provide a comprehensive source of information for engineering students and highway engineers practising in hot, tropical countries. The first part deals with tropical soils and roadbuilding materials, describing their formation, characteristics and methods of testing. The second part describes the methods used to design and build roads, and includes chapters on all types of pavements, including both concrete and unpaved roads.