The system design included a liquid chemical storage tank, a pump, a 3,100-foot dispensing system with barrier-mounted and pavement-embedded spray nozzles, an environmental sensor station (ESS), a computerized control system, and a closed circuit television (CCTV) camera for remote viewing. The control system monitors weather and road condition data from the ESS and automatically activates the dispensing system when predetermined conditions exist. The system also alerts dispatchers and the North Central Region maintenance supervisor when the anti-icing system is activated.
Using historical crash data, the annual rate of collisions over a three-year period was determined and compared to the expected rate of collisions after system implementation. It was estimated that 80 percent of the snow, ice, and wet pavement crashes would be eliminated (see key assumptions in notes below).
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