STUDY AND DEVELOPMENT OF HIGHWAY ADVISORY INFORMATION RADIO

A complete Highway Advisory Information Radio (HAIR) system was developed for audibly conveying traffic advisory and emergency information to the motoring public using a low power, limited coverage roadside transmitter at dedicated frequencies of 530 kHz and 1606 kHz. Types of information conveyed include emergency messages, warning tones indicating the approach of an emergency vehicle, advisory messages to alert motorists of anomalies ahead and alternate routes, and trip needs such as information pertaining to gas, food and lodging services. A major objective of the program was the development of special automotive receivers permitting the motorist to automatically receive the traffic messages while listening to his favorite AM or FM broadcast station. The radio transmission system utilized audio tone codes to achieve control of the automatic receivers; however, the system also permitted message reception with over 90 percent of existing AM automobile radios. Surveys of commercial automotive AM receivers were made to determine tuning range limits and receiving sensitivities at 530 kHz and 1606 kHz. It was found that the capability of automotive AM radios to receive out-of-band signals depends almost entirely on field strength and not on the limits of tuning range.

• Corporate Authors:

  Atlantic Research Corporation

  5390 Cherokee Avenue
  Alexandria, VA  United States  22314

  Federal Highway Administration

  1200 New Jersey Avenue, SE
  Washington, DC  United States  20590
• Authors:
  • Anderson, R A
  • Robertson, R G
• Publication Date: 1974-12

Media Info

• Pagination: 260 p.

Subject/Index Terms

• TRT Terms: Highway traffic; Highways; Information systems; Radio; Traffic safety
• Old TRIS Terms: Medium frequencies; Vehicular traffic
• Subject Areas: Data and Information Technology; Highways; Operations and Traffic Management; Safety and Human Factors;

Filing Info

• Accession Number: 00090491
• Record Type: Publication
• Source Agency: National Technical Information Service
• Contract Numbers: DOT-FH-11-8045
• Files: NTIS, USDOT
• Created Date: May 29 2002 12:00AM