^ Easier said than done if you need to drive somewhere and park for a while, plus it's not exactly convenient to wash down, rinse, whatever, a vehicle when it's below freezing and your hoses are inside and stiff as a board, and the last thing you want is to add more water to your driveway so it's a solid sheet of ice. You can salt your driveway too, but is more salt the answer?
It does depend on not only the geographic location but the particular city. Some will salt roads the moment flurries start building up.