The Lower Crossvalley, 29 Expressway at the Alden Exit.
At the Alden Exit, on both ramps entering the 29 Expressway, Troopers park up the ramp where you can not see them until you go past the exit, and they shoot you with radar as you pass. Then they chase you down and bust you!
Sneaky! They are there at peak traffic times and on the weekends.