Highway Advisory Radio (HAR) systems, also known as Travelers' Information Stations (TIS), are low powered AM radio stations licensed to governmental agencies to broadcast messages to travelers or residents through the use of their AM Radio:
The Highway Advisory Radio (HAR) system utilizes AM or FM radio frequencies to broadcast messages to motorists. Informing drivers before they encounter delays and add to traffic problems is important for maintaining a safe driving environment. Since AM radio is a standard feature in nearly all vehicles, using HAR is one of the most practical ways to get the message out to everyone.
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