GPS-styrd saltspridning: test på avlyst bana

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Staffan Möller

The purpose of the project is to test and document GPS controlled salt spreading on a test track by weighing ditributed salt quantities and compare with intended amounts of salt at different spreading amounts, spreading widths, symmetries, speeds and types of salt (pre wetted salt and brine). The test is to study how salt distribution is affected by changes in the road section both to the right and to the left of the through lane or the two through lanes. Such changes should imitate e.g. transition from two lanes to one on a 2 + 1 road or passing a refuge or a bus-bay. A test track was marked with tape. In order to measure the spread salt quantities plastic sheets, with the size 1.1 x 1.6 metre, were taped on the surfacing. Centered over the plastic sheets cloths of curtain fabric, with the size 1.0 x 1.5 metre, were placed. The cloths were held in place by chains. When a comparison is made between the salt distribution with and without GPS control of the salt spreader on two lanes and a bus-bay and on a transition from two lanes to one the following conclusions are drawn. Using pre wetted salt on two lanes and a bus-bay at 30 and 45 km/h the results with GPS control got better on the right lane. On the left lane the results were about the same. Both with and without GPS control small amounts of salt ended up on the bus-bay. Using brine on two lanes and a bus-bay at 40 and 65 km/hour the results on the right and left lane respectively were about the same with and without GPS. On the bus-bay the results with GPS got worse. Using pre wetted salt on a transition from two lanes to one at 30 and 45km/h the results with GPS control got worse on the right lane. On the left lane GPS control resulted in higher amounts of salt, but not better results, compared with without GPS. Using brine on a transition from two lanes to one at 40 and 65 km/hour the results with GPS control got better both on the right and the left lane.

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