Motorist information systems have increased highway safety, improved overall traffic flow, as well as alleviated driver frustration and confusion. Two information systems that are currently being used are variable message signing (VMS) and highway advisory radio (HAR). VMS provides the same visual format as existing signs except the copy of the sign can be revised or updated as traffic conditions change. HAR, on the other hand, uses the AM radio receiver in the vehicle to convey radio information to the motorist on hazardous road conditions, traffic congestion, alternate routing, off-road services, and tourist attractions. The report summarizes HAR operations activities, commercially available hardware, and licensing requirements in the United States. The report provides a review of HAR system uses in eight States. The review covers HAR system surveillance, advance signing, and broadcasting equipment. The report also catalogues commercially available HAR transmitters, modulating sources (tape recording equipment), and antenna types. The final section of the report focuses on the current Federal Communications Commission (FCC) rulemaking relative to HAR. Included in this discussion are HAR applications and authorization requirements as well as HAR frequencies, conditions, limitations, and technical standards. For completeness, all current FCC rulemaking for HAR is included in the appendixes.


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    Title :

    Highway Advisory Radio Operational Site Survey and Broadcast Equipment Guide


    Contributors:

    Publication date :

    1979


    Size :

    129 pages


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English




    Highway Advisory Radio Message Development Guide

    R. D. Huchingson / C. L. Dudek / W. Dorsey | NTIS | 1982


    Investigation of Operational Procedures for Highway Advisory Radio Systems

    B. L. Smith / C. C. McGhee / B. R. Newman et al. | NTIS | 1995


    Highway advisory radio

    Turnage, H.C. | Tema Archive | 1980