There are a couple more sites on interstate 390 they are traveling southbound but could also be used for northbound traffic there is the well known trap under the Rt 36 overpass, but traveling south they also hide up under the the next overpass they drive up a hill and there is no way to see them until you are on top of them. Also there are many "state turn-arounds" the spots that connect the north and south bound lanes and i have seen state troopers parked in these looking for speeders. Generally anything over 75 will get you a ticket (posted limit is 65) there are a handful of these turn-arounds between exit 6 (Groveland- rt 36) and exit 5 (Dansville – Rt 36)