VEHICLE TRACKING SYSTEM FOR HEADWAY MONITORING

The patent application concerns a vehicle tracking system comprising a plurality of antenna loops buried under a roadway. The loops are divided into groups and are excited by small transmitters in the vehicles being monitored. Associated with each group of loops is a receiving detector. Also associated with each group is a scanner that causes a switch to individually and sequentially connect the loops to the detector. When the detector produces an output, indicating that a vehicle is near the loop being sampled, an inhibit device stops the scanner thus locking the loop that is excited to the detector. A binary number identifying the loop that is excited is placed in an address register and is coupled by a buss to a central control unit. Thus, the location of vehicles is found by reading the addresses on the buss.

• Supplemental Notes:
  • Government-owned invention available for licensing. Copy of application available NTIS.
• Corporate Authors:

  Department of Transportation

  1200 New Jersey Avenue, SE
  Washington, DC  United States  20590
• Authors:
  • Evans, R R
• Publication Date: 1973-11-1

Media Info

• Pagination: 10 p.

Subject/Index Terms

• TRT Terms: Antennas; Detectors; Highway traffic control; Monitoring; Patent applications; Traffic engineering; Vehicle detectors
• Uncontrolled Terms: Monitors
• Old TRIS Terms: Gpdot; Loop antennas
• Subject Areas: Operations and Traffic Management;

Filing Info

• Accession Number: 00051669
• Record Type: Publication
• Source Agency: National Technical Information Service
• Report/Paper Numbers: PAT-APPL-411 671 Patent Apl
• Files: NTIS, USDOT
• Created Date: Mar 25 1974 12:00AM