Highway advisory radio (HAR), sometimes also called travelers' information stations (TIS), are licensed low-power AM radio stations set up by local transport departments to provide bulletins to motorists and other travelers regarding traffic and other delays. These are often near highways and airports, and occasionally other tourism attractions such as national parks.

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  • Highway advisory radio (HAR), sometimes also called travelers' information stations (TIS), are licensed low-power AM radio stations set up by local transport departments to provide bulletins to motorists and other travelers regarding traffic and other delays. These are often near highways and airports, and occasionally other tourism attractions such as national parks. In the latter case, they often provide a loop of prerecorded information about the park's historic and other background information. These systems are licensed by the FCC in the United States under CFR Part 90.242 and are limited to a maximum signal of 2mV/m at 1.5km (0.9 mi) using a power of up to 10 watts to achieve this limit in the case of vertical antenna systems (the most common type). Up to 50 watts in the case of the radiating cable antenna systems may be used to achieve a maximum of 2mV/m at 60m (200ft) from the radiating cable. Radiating cable systems are limited to a continuous antenna length of 1.9 km (1.2 mi). Cable systems are used for situations such as Dulles International Airport with very long limited-access approach roads where multiple systems can be placed in 1.9 km segments. In some cases, such as LAX both radiating cable and antenna systems are employed as backup systems for one another. Critical evacuation systems, such as those in the Florida Keys and near chemical and nuclear facilities, have been granted exceptional power waivers for emergency operations. These systems will typically operate under the normal power level, but have permission to exceed that limit, typically to 100 W, in the face of a critical emergency evacuation situation. The audible signal is required to include an audio low-pass filter which rolls off frequencies above 3 kHz. Content is defined by the FCC as "noncommercial voice information pertaining to traffic and road conditions, traffic hazard and travel advisories, directions, availability of lodging, rest stops and service stations, and descriptions of local points of interest. It is not permissible to identify the commercial name of any business whose service may be available within or outside the coverage area of a Travelers' Information Station. However, to facilitate announcements concerning departures/arrivals and parking areas at air, train, and bus terminals, the trade name identification of carriers is permitted. " In the United States, only governments may have licenses for TIS/HAR stations, with some exceptions granted for quasi-governmental agencies and authorities. The FCC formerly reserved the bottom and top channels (530 and 1610) on the AM band for these stations, before the Extended AM broadcast band (1610 to 1700) was introduced in North America. Systems may currently be licensed on any frequency from 530–1700 kHz. (Most radios tune to 1710; however, this does not seem to be used for any stations so far. ) LPFM stations may be licensed to governments as well, but these are not considered part of the TIS/HAR service. Stations for U.S. national parks and other units under the U.S. federal government are licensed by the NTIA rather than the FCC.
  • 路側放送（ろそくほうそう）は、国道事務所や警察、東日本高速道路・中日本高速道路・西日本高速道路（旧日本道路公団）などの道路管理者が、道路沿いに周波数1620kHz（一部で1629kHz）の電波を発信し、運転者に道路状況などの交通情報を知らせるラジオ放送。ただし、電波法上の扱いは「特別業務の局」とされている。 特に、公団民営化後の道路会社三社が管理する高速道路で行っているものは「ハイウェイラジオ」と呼ばれる。なお、首都高速道路で放送されていた「首都高速ラジオ」は、2006年3月に放送終了した。
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  • Highway advisory radio (HAR), sometimes also called travelers' information stations (TIS), are licensed low-power AM radio stations set up by local transport departments to provide bulletins to motorists and other travelers regarding traffic and other delays. These are often near highways and airports, and occasionally other tourism attractions such as national parks.
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  • Highway advisory radio
  • 路側放送
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