Wind crosses the open ground by the Oakland County airport with nothing standing in its way, and a lot that was clear at midnight can be drifted shut by four. RDK Maintenance LLC works Waterford in exactly those hours — plowing drives and lots, shoveling walks and entries down to bare pavement, salting where meltwater will refreeze before sunrise. Winter in this township is less about one enormous storm than a long string of small ones, and the answer is turning out for every single one. The measure of a night's work is simple: people arrive in the morning and nothing about the snow slows them down.