Communications: directive radio wave systems and devices (e.g. – Return signal controls external device – Device actuated by presence of land vehicle
Patent
1992-12-07
1994-08-09
Sotomayor, John B.
Communications: directive radio wave systems and devices (e.g.,
Return signal controls external device
Device actuated by presence of land vehicle
342114, 342 28, 342456, G01S 1391
Patent
active
053370821
ABSTRACT:
A method of and apparatus for providing information which may be used in making traffic management decisions for limited access highways is disclosed. The method and apparatus employs microwave radar to obtain information bearing signals which are processed to determine the vehicle direction and speed. The apparatus includes the capability of emulating in-the-road or on-the-road sensors to provide output pulse pairs which appear as if generated by switch closures. The method and apparatus also has the capability of providing "wake-up" signals commensurate with a predetermined number of consecutive vehicles which pass a preselected point traveling at an abnormally low speed. Because the method and apparatus are vehicle direction sensitive, the capability of monitoring traffic flow by looking across lanes is also present.
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patent: 3978481 (1976-08-01), Angwin et al.
patent: 4985705 (1991-01-01), Stammler
Sotomayor John B.
Whelen Technologies, Inc.
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