There is an hour in Mount Vernon when the streetlights still own the road, and that is the hour ADR Snow Management is already out in it. Plow blades drop along Sandford Boulevard, salt goes down at the mouth of every driveway, and by the time the first car door opens the pavement is dark and wet and passable. When the warm months come the same routes turn green and the work becomes mowing, trimming and the tidy line where lawn meets curb. Mount Vernon packs a whole city into a few square miles — narrow drives, shared aprons, front yards the size of a good rug — and that asks for a light hand and an early start. Both are here.