These guidelines have been developed to help Virginia Department of Transportation (VDOT) personnel effectively operate highway advisory radio (HAR) systems. The guidelines are organized in five sections: personnel, transmitter placement, advisory signing, message development, and equipment maintenance. Each section contains information that applies to both portable and permanent HAR. Appendices A and B contain sample HAR messages for incident and non-incident situations. Appendix C includes information on maintaining and updating the guidelines. The guidelines are based on research reported by the Virginia Transportation Research Council in An Investigation of Operational Procedures for Highway Advisory Radio.