Patent ID: 6750787
Filing Date: 2004-06-15
Classification: G08B,G08G

Abstract:
An apparatus for measuring the speed, direction of travel and cumulative count of one or more moving vehicles in a stream of traffic comprising:a. a beam emitter unit comprising at least two visible wavelength laser beam emitters wherein said laser beam emitters are mounted to generate two visible wavelength laser beams coplanar and parallel to each other and having a lateral separation distance between said laser beams of approximately one foot; and b. a beam sensor unit comprising: i. at least two laser beam sensors wherein said laser beam sensors are mounted to receive and distinguish the on/off status of said laser beams; and ii. a beam status discriminator and a timer means for electronically pausing said beam status discriminator and electrical processing for a one second period after said status of said laser beams is interrupted off; wherein said beam emitter unit and said beam sensor unit are each positioned to emanate said laser beams between about 4-8 inches above the surface of a roadway.