Traffic sign and improved system for recording vehicle speed
Patent 4173010 Issued on October 30, 1979. Estimated Expiration Date: 
October 30, 1996. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
October 30, 1996. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 2250442 2769165 2813468 3165373 3181150 3544958 3788201 3827070 3840848 InventorApplicationNo. 05/573779 filed on 05/01/1975US Classes:340/937, With camera340/936, Speed and overspeed346/14MR, Meter reading346/33D, Speed377/20, Time combined with measurement of another parameter377/9VehiclesExaminersPrimary: Caldwell, Sr., John W.Assistant: Groody, James J. Attorney, Agent or FirmInternational ClassesG08G 1/052 (20060101)G08G 1/054 (20060101) G08G 1/01 (20060101) AbstractSensors 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 are spaced a predetermined distance apart in the direction of travel, and provide information to a logic system to measure the speed of vehicles traveling along the roadway. The logic system is connected to a simple readout sign displayed for observation by drivers of vehicles along such roadway, which sign indicates whether a vehicle is traveling at a proper rate, or too fast or too slow, or too close to a preceding vehicle. A modified motion picture camera is provided adjacent the roadway to film a vehicle that is moving too rapidly, and a modified film editing device is provided for counting the frames exposed, and thereby to determine the speed of such vehicle. This latter device preferably reads out direct in miles per hour.Other References
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