An Investigation of Operational Procedures for Highway Advisory Radio Systems

About the report:

A key objective of Intelligent Transportation Systems (ITS) is to provide travelers with accurate, real-time information, helping them make better decisions about when to travel, what mode to use, and what route to take. An interface is necessary to convey this information. Currently, the AM radio is an interface available in nearly all automobiles. The Virginia Department of Transportation (VDOT) has deployed highway advisory radio (HAR) in several regions of the Commonwealth. This study reviewed previous research and technical information, examined the use of HAR in Virginia and other states by interviewing key personnel, and surveyed Virginia motorists to ascertain the public's perception of HAR. The results were used to develop the HAR Operational Guidelines, published in a separate document, and the conclusions contained in this report. Specifically, Proper HAR operation is personnel-intensive. To be of actual value to motorists, information must be gathered from many agencies, consolidated rapidly and accurately, and frequently updated. Presently, information provided on HAR stations is of limited value to motorists. Consequently, motorists depend on commercial radio station traffic reports for most of their information, instead of tuning in to HAR broadcasts. Changeable message signs should be used to advise motorists when they are in an HAR broadcast area, directing specific messages to the appropriate audience. Conventional vertical antennae are more cost-effective than radiating cable systems and should be used exclusively.

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