Question

Why do road crews spred sand over icey roads?

Answer 1

You mean Salt, right?

Salt helps remove ice from the roads, making is safer to drive on.

Putting Sand on roads would, if anything, make them even more dangerous.

Answer 2

Sand is used as a way to keep traction for the cars that pass through the streets. The sand works to keep cars on the roads and prevent any major accidents that may occur.