Going either north or south on Duncan Ave they set up under or around the tollway bridge. Coming south there is a sign saying 30 as you come to a slight curve in the road dropping from 55.By the time you get around the curve they have you. The fine is $125.00 and up.Going North on Duncan as you come down a hill and around a curve before Trout Park Blvd.they like to sit there also. By the time you come around the curve they have you.