On Treat Blvd. coming from Concord heading towards Walnut Creek light there is a parking lot for the Lime Ridge Open space on the right side of the road. It is on a slight curve going downhill, and the posted speed is 40 MPH. Motorcyle cops hide in twos or threes in the parking lot which is out of view until too late and nab drivers as they come down the hill. It is easy to reach 55 without even touching the gas on this hill and they will take advantage of this fact. Besides myself, I have seen many people pulled over at this location. Better keep your eye on the speedo when passing this area!