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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.
Reflections
On the whole, spreading salt with GPS control gave about the same results as with no
change of the salt spreader. On average the measured amounts of salt corresponded, in
most cases, fairly well with the intended.
However, too small amounts of salt were spread on the bus-bay, especially when pre
wetted salt was used. One reason could be that the salt spreader plate rotates clockwise
seen from above and is designed to spread to the left. Thus, the spreading to the right
becomes worse. Salt spreading to the left is the most common adjustment of the
asymmetry and is used when you want to spread salt on two lanes simultaneously. Another
reason could be the formation of turbulence behind the salt truck which will result in more
salt on the lane where the truck is running and less salt on the outer parts. This effect is
most evident at higher speed and for pre wetted salt.
At the same time, GPS control of the salt spreader means that the quality of the salting
can be improved because the salt, to a larger extent, is spread only where it is needed.
GPS-control also has a positive effect on road safety and the working environment for
the driver because he does not need to change the spreader adjustments but can
concentrate on driving instead.
8 VTI rapport 791