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PrePass is an intelligent transportation system (ITS) that electronically verifies the safety, credentials, and weight of commercial vehicles as they approach participating state highway weigh stations. Because they comply electronically, commercial carriers enrolled in PrePass are authorized to bypass these facilities rather than pull in for ...
The system may consist of equipment at the weigh station itself, as well as a truck mounted transponder or smartphone, usually placed on the inside of the windshield or on the dashboard. The transponders are similar to those used for toll collection. Each transponder is directly registered to a specific truck, and contains a unique identification.
Weigh-in-motion or weighing-in-motion (WIM) devices are designed to capture and record the axle weights and gross vehicle weights as vehicles drive over a measurement site. . Unlike static scales, WIM systems are capable of measuring vehicles traveling at a reduced or normal traffic speed and do not require the vehicle to come to a st
In 1959, Nobel Economics Prize winner William Vickrey was the first to propose a similar system of electronic tolling for the Washington Metropolitan Area.He proposed that each car would be equipped with a transponder: "The transponder's personalized signal would be picked up when the car passed through an intersection, and then relayed to a central computer which would calculate the charge ...
Their sensors, customized by each scale manufacturer, are generally based on strain gauges. They may use temperature sensors to allow for correct results with varying tempeatures. [15] As with other electronic scales, the bin weight may be transmitted to an operator readout, or via a wide area network to a company office or corporate headquarters.
Long baseline systems get their name from the fact that the spacing of the baseline transponders is long or similar to the distance between the diver or vehicle and the transponders. [3] That is, the baseline transponders are typically mounted in the corners of an underwater work site within which the vehicle or diver operates.
LBL systems yield very high accuracy of generally better than 1 m and sometimes as good as 0.01m along with very robust positions [7] [8] This is due to the fact that the transponders are installed in the reference frame of the work site itself (i.e. on the sea floor), the wide transponder spacing results in an ideal geometry for position ...
Once the trigger fires, there is a delay set to allow the package to move to the "sweet spot" (center) of the weigh bed to sample the weight. The weight is sampled for a given duration. If either of these times are wrong, the weight will be wrong. There seems to be no scientific method to predict these timings.