AASHTO GSGLC-5

These guidelines were developed to assist state DOTs and transportation agencies in selecting the most appropriate traffic generators for display on freeway and expressway supplemental guide signs. They provide a basis for these agencies to develop individual state policies, which consider local needs, customs, and legal requirements.

The guidelines are divided into three parts: Part I, Guidelines for the Selection of Supplemental Guide Signs for Traffic Generators Adjacent to Freeways; Part II, Guidelines for Airport Guide Signing; and Part III, List of Control Cities for Use in Guide Signs on Interstate Highways.

The guidelines are incorporated by reference in the MUTCD, which recommends guidelines for developing appropriate policies on supplemental guide signs for traffic generators.