The hardest nights in Lisle are not the snowy ones. They are the January nights that begin as rain and end at nineteen degrees, glazing every step, ramp and walkway in the village. Superior Ground Services works against exactly that, plowing drives and lots, shoveling stairs and entryways, and laying salt before the refreeze can take hold. The measure of a good night is that nobody slips and nobody has to think about why. Trucks roll while the streets are still empty, and by the time the first headlights come down the block the pavement is dark and dry.