Developments in highway engineering are taking place at a great speed. New materials, design concepts and construction practices are emerging as road users demand high quality roads. India too is modernising its road system and is planning to construct high speed highway facilities. With this in the background, the present edition of the book has been revised extensively with many latest practices in design and construction followed around the world has been added in each chapter. While old data has been revised and many refinements made throughout ; new chapters on Financial Analysis of Highway Projects and Road pricing have been added in this book. Dr. L.R. Kadiyali, the author of the previous edition, has been very ably assisted by Dr. N.B. Lal in this effort. Dr. Lal has brought in several years of experience in research and teaching in the field and has enhanced the coverage and content of the Textbook.