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Process and apparatus for measuring the dynamic loads applied to a highway by the road traffic

  • US 4,712,423 A
  • Filed: 02/07/1986
  • Issued: 12/15/1987
  • Est. Priority Date: 01/04/1985
  • Status: Expired due to Term
First Claim
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1. A process for measuring the dynamic loads applied to a highway by the road traffic, in which a rectilinear piezo-electric cable is placed across the highway so that the wheels of the axles of the vehicles circulating on the highway subject it, upon passage thereof, to a pressure to which it responds by the emission of an electrical pulse and the corresponding dynamic load is calculated from the parameters of said pulse, whilst the speed of the vehicle is measured with the aid of the pulse delivered by a second rectilinear piezo-electric cable disposed on the highway at a certain distance from the first-mentioned cable, by determination of the duration of the time gap separating the appearance of the pulses respectively furnished by the two cables for the same wheel,the dynamic load being deduced from the area of the contour, with respect to time, of the pulse delivered by the first-mentioned cable and from the speed of the vehicle, by making the product of said area by said speed.

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