Three in the morning on Lowell Road, and the plazas are empty acres of white under the parking lights. DB Removal, LLC works those hours — stacking lots into clean windrows, cutting back the corners so the aisles stay usable, clearing entrances and sidewalks, then salting and sanding before anybody turns in for a coffee. Storms coming off the Merrimack tend to arrive wet and heavy in Hudson, which means a lot has to be pushed early and pushed again. There is a real pride in watching the first vehicle of the day roll straight across ground that was buried an hour ago. Steps and walks get shoveled by hand, because that is the part people actually walk on.