Construction zone is posted 40, but for much of it (except the bridge right after the altered area which you do have to slow down in) is unobstructed, leading motorists to ignore it. Saw trap set pretty late at night, cop was hiding at the entrance to route 1 from Plainsboro rd. and drove like a bat out of hell (90+) to catch someone up ahead. Remember that NJ construction zone limits apply 24/7 (crazy I know) so if you are not in a pack of cars, drive really slow.