The rule of the road--the simple requirement that traffic keep either to the left or to the right--has a history long antedating the appearance of the automobile. This volume, the first book-length treatment of the subject, discusses the origins and history of the rule of the road and provides complete information on current practice throughout the world. A well-written account of a universal arrangement that has largely gone unnoticed by scholars, this book fills a gap in scholarship on the history of transportation.