Winter nights in Westford glow a little on the Nashoba Valley side of town, the ski slope lit above the treeline while the rest of the road stays dark. Nashoba Paving Company works under that same sky, plowing driveways and lots so the morning finds them bare. Blades run to the surface, banks get pushed back before the next storm needs the room, and walkways are cleared and treated. Snow stops falling at odd hours, so the trucks go out on the storm's schedule rather than the clock's. By the time the slope lights shut off, the pavement is open.