Download or read book 55 Mph Fact Book, 1979 written by United States. National Highway Traffic Safety Administration. Enforcement and Emergency Services Division and published by . This book was released on 1979 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This, the fourth edition of the 55 mph fact book, contains data collected from various sources since the speed limit was imposed. This publication is intended as a reference for the more significant facts and figures about the 55 mph speed limit and is by no means an exhaustive encyclopedia on the subject.