When originally published in 1975, (here re-issuing the 3^rd edition of 1985), this was the only genuinely introductory textbook to the subject of transportation planning. The introductory chapter places the issue of transport in its broader societal context, relating it to demographic, socio-economic, political and environmental considerations. The increasing importance of technology is recognized in the chapter which covers commonly used software packages. As a whole the book provides a basic introduction to the traffic estimation stage of the transport planning process and forms a general guide and survey to the whole subject.