Every December the hill at La Salette lights up and half of southeastern Massachusetts drives to Attleboro to see it, which means the roads and lots around here have to be open no matter what the sky is doing. G&M Property Service keeps those kinds of hours — out at three in the morning, headlights full of falling snow, plowing while the town sleeps. The aim is a driveway a car can back out of at six-thirty without a second thought: pavement showing, walkway shoveled, the pile pushed where it will not block the view. Storms do not announce themselves politely, so the answer is to be awake already. Snow removal for properties in Attleboro and nearby towns.