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.