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There's still snow on the road, but you say you've gritted. Why is this?

Question:
There's still snow on the road, but you say you've gritted. Why is this?
Answer:

We rely on traffic to help dissolve salt into a solution which in turn lowers the freezing point of water.  This is why treated motorways and other routes with high amounts of traffic will clear much more quickly than routes where there is less traffic. 

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