The Wallkill runs the wrong way through Franklin — north, against every expectation — and there is something of that stubbornness in a plow truck out at four in the morning. Aiken's Tree Service LLC clears driveways, walks and lots across the borough while the streetlights are still doing all the work. Sussex County snow comes heavy and wet off the highlands and then freezes hard by breakfast, so the salt goes down while the pavement is still telling the truth. By the time the county road fills with headlights, the driveway is a clean black rectangle and the walk is wide enough for two. That is the whole job: someone steps outside, and nothing is in the way.