This spot is perfect for the cops. The location is at the bottom of the downhill on the southbound side and the exit sign here is very high which allows the cop to park on the side of the sign opposite the traffic. This trap is typically used in the evening hours when even trying to see the car there is very difficult from the high reflectivity of the sign. The easiest way is to look for an extra set of reflectors under the sign (there are normally two to start). However even seeing the car is usually too late since as you round the corner at the top of the hill they’ll start to track your speed. It’s nearly an infallible trap, your best bet is just to slow down until you know no one is there for sure.