Snow arrives in Cranston with the wind off Narragansett Bay behind it, and by midnight the streets around Knightsville are one soft, unbroken white. That is when H&M Snow Removal Services is out — blade down, salt in the hopper, working a route that has to be finished before the first shift leaves for work. Driveways get opened wide enough to turn around in, and steps and walks get taken down to the pavement rather than skimmed. Ice control follows, because a slick apron at the end of a driveway undoes an otherwise good night. By the time the sky goes gray over Cranston Street, the block is passable and the truck is still moving.