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The purpose of this manual is to provide clear and helpful information for maintaining gravel roads. Very little technical help is available to small agencies that are responsible for managing these roads. Gravel road maintenance has traditionally been "more of an art than a science" and very few formal standards exist. This manual contains guidelines to help answer the questions that arise concerning gravel road maintenance such as: What is enough surface crown? What is too much? What causes corrugation? The information is as nontechnical as possible without sacrificing clear guidelines and instructions on how to do the job right.
The nature, scope and operation of Emergency Highway Traffic regulation (EHTR) is discussed in this guide which was designed to help the states prepare plans which would work effectively, both individually and collectively. It will also serve as a tool to aid in the updating of the State's plan through the publication of changing national policies and programs. The general background of the EHTR is reviewed. The broad fields of civil emergency planning and natural disaster are briefly discussed. The organizations involved in emergency planning and in EHTR operations are reviewed. The functions, personnel, equipment and communications in EHTR operations, as well as aspects such as regulated routes, road-use permits and EHTR signs are also covered. The role of the military, and nuclear radiation hazards to highway transportation are considered.
Vols. 76 , 83-93 include Reference and data section for 1929 , 1936-46 (1929- called Water works and sewerage data section)