Vehicle axle detector for roadways

Details Vehicle axle detector for roadways Vehicle axle detector for roadways

1996-08-05

1998-10-13

Hofsass, Jeffery A.

Communications: electrical

Vehicle detectors

Photoelectric

340933, 340935, 340936, G08G 104

Patent

active

058218793

ABSTRACT:
A system for monitoring traffic flow on multi-laned roadways. The system includes a plurality of radiation sources such as light emitting diodes, LEDs and a corresponding set of radiation detectors such as photo diodes. The radiation sources and detectors form a crossed array as well as direct paths across the roadway. By correlating radiation beam interruptions including the time and order of interruption, a signal processor such as a computer is able to determine traffic parameters for each lane. Multiple beams in parallel aid the reliability of the system. Using retroreflectors with the radiation sources and detectors on the same side of the roadway simplifies installation.

REFERENCES:
patent: 2366152 (1944-12-01), Lauterbach
patent: 3872283 (1975-03-01), Smith et al.
patent: 5636028 (1997-06-01), Stringer et al.
Lu, Jian., Traffic Data Logical Detection by Infrared Sensor Array., ITE 1993 Compendium of Technical Papers, 493-497.
Haberman, Richard, Mathematical Models, Prentice-Hall, Inc. (1977) pp. 259-298.
Greenshields, Bruce D., A Study of Highway Capacity, Hiighway Research Board, Dec. 6-7,1934, pp. 448-477.
U.S. Department of Transporation, Federal Highway Administration, The 1985 Highway Capacity Manual, Apr. 1986.

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