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WIM systems can employ various types of sensors for measurement. The earliest WIM systems, still used in a minority of installations, use an instrumented existing bridge as the weighing platform. [38] [39] Bending plates span a void cut into the pavement and use the flexure as the wheel passes over as a measure of weight. Load cells use strain ...
There are weight detecting devices in the roadway itself. A driver may get a red light. On these occasions, the truck must pull into the weigh station for the normal weigh-in procedure. The most common reason a truck is "redlighted" is a weight problem, or a random check.
Print/export Download as PDF; Printable version; In other projects ... Speed sensors are machines used to detect the speed of an object, usually a transport vehicle. ...
Print/export Download as PDF; Printable version; In other projects Wikidata item; Appearance. move to sidebar hide. A vehicle instrument is an ...
A Fast Falling Weight Deflectometer (FFWD) is a FWD with pneumatic or electric actuators rather than hydraulic, making the mechanics several times faster. A Heavy Weight Deflectometer (HWD) is a falling weight deflectometer that has higher loads (typically 300 kN to 600 kN), used primarily for testing airport pavements.
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For dynamic track scales with force sensors, several force sensors are drilled and pressed into the track. When a train passes over the scales at up to 30 km/h, the rail is deformed by the mass of the vehicle (deformation). The change in material stress deforms the sensor, in which strain gauges are mounted as in a classic load cell.