05192954 is referenced by 53 patents and cites 14 patents.

Antennas designed for use in producing effective electromagnetic capture zones for transponders mounted on moving vehicles. The antenna systems disclosed are principally designed to be mounted at or near the surface of a roadway carrying the vehicle whose transponder is to be interrogated. A principal advantage of the antennas of the invention is minimal interference with normal operation of the road and greatly reduced cost of installation when used in providing vehicle identification, toll collection, or communication with the transponder carrying vehicle.

Title
Roadway antennae
Application Number
234570
Publication Number
5192954
Application Date
March 8, 1991
Publication Date
March 9, 1993
Inventor
Donald P Gillis
Edmonton
CA
Michael H Hryciuk
Edmonton
CA
Conrad M B Walker
Edmonton
CA
William K Brockelsby
Edmonton
CA
Agent
Francis J Lidd
Assignee
Mark IV Transportation Products Corporation
IL, US
IPC
G01S 13/74
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