The principles of directional signing and relationship between geometric design and signing are discussed. Directional signing should be designed so as to provide guidance to all types of motorists. At any particular location, these will range from commuters who travel the road every day to people who have never been over the road before. The critical element, with regard to signing, in the traffic stream, even though it be only a small portion of the total, is the stranger. If directional signing is adequate for the stranger, it will also be adequate for the local motorist. The principal means of directing traffic is through the use of place names, sign routes, and street names. The greatest aid to the long-distance traveler is the sign route. Types of interchanges and ramp design and location are discussed in relation to dovetailing the signing and interchange design. It is concluded that effective directional signing is an integral portion of the highway and is an indication of careful planning and integrated design.
Abstract