Enforcement alternates on both sides of the highway both north and southbound. Usually two or more cruisers are positioned on the north side in a convience store lot. On the southbound side they are in the lot of a small shopping center and grab you before you get into Martin county which is only about a quarter mile south. These traps are in St Lucie County. If you have a good detector you can pick them up some distance away as this is a six lane highway in this area and is a long straight stretch.