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| Number | Title | Issue Date |
| 4379280 | Vehicle detection systems The detector system comprises a CW transmitter which is coupled to a receiver in a manner such that an approach of a vehicle produces an amplitude increasing excursion in the envelope of the received signal. At the receiver, the envelope of the received s... | 04/05/1983 |
| 4368428 | Method and arrangement for determining the velocity of a vehicle A vehicle detection system including a pair of inductive loops arranged in the road surface for measuring the speed of passing vehicles. Each loop is the frequency determining element of an oscillator of first and second vehicle detectors. A first measuri... | 01/11/1983 |
| 4258351 | System for collection and transmission of road traffic information The system for collection and transmission of road traffic information comprises a lens system installed on a tall structure such as on the roof of a building and angled vertically or diagonally to include in its field of view a road area subjected to obs... | 03/24/1981 |
| 4234923 | Vehicle detection systems In the disclosed system the speed of a vehicle passing over the sensing coils of the detection system is determined by sampling the envelope voltages occurring during the leading edge portion of the disturbance in the envelope of the received signal produ... | 11/18/1980 |
| 4219878 | Speed measuring device A special accessory for traffic radar devices includes two operating routines. These routines are to be used with a programmable microprocessor which comprises a portion of the traffic radar device. The routines are designated as a stopwatch routine and a... | 08/26/1980 |
| 4173010 | Traffic sign and improved system for recording vehicle speed Sensors are positioned adjacent a roadway. Such sensors conveniently comprise pressure switches connected to two speed hoses to be run over as in a traffic counter. Alternately, photo-optical, acoustical, or magnetic field sensors can be used. The sensors... | 10/30/1979 |
| 4087753 | Communication apparatus for communicating between a first and a second object An improved communication method and apparatus for communicating between a first object and a second object wherein the first object includes apparatus for generating and transmitting a modulation signal having at least a predetermined number "L" pulses w... | 05/02/1978 |
| 4031510 | Speed detection system for automobiles and other motor-driven objects A system for accurately detecting and registering the speed of motor vehicles or other motor-driven objects moving between two closely spaced points of detection includes a calibrator for adjusting the system for varying spacings between points of detecti... | 06/21/1977 |
| 3983531 | Vehicle-responsive signal means A roadside, overspeed signal indicator is operated by a moving vehicle. Two vehicle-responsive, detectors are spaced in the direction of travel of the vehicle in a traffic lane and are preferably loop detectors embedded in the traffic lane. An adjustable ... | 09/28/1976 |
| 3970938 | Method and apparatus for determining motion and speed This is a method, and apparatus for practicing such method, wherein motion of an object may be detected remotely and relative speed of the object may be detected wherein a transmitter having an antenna is attached to the object and changes in the collecto... | 07/20/1976 |
