Traveling NW direction on Old Moulton Road going from the Beltline Highway toward Moulton Street, the speed limit reduces from 45 mph to 30 mph. Soon after the speed limit reduces to 30 mph there is well hidden spot that Decatur Police will park and run radar. I do not understand why the speed is limit is reduced. When traveling in the NW direction you will also will be going down a slight hill. I travel this road every day to and from work. I literally have to slam on my brakes to reduce my speed to 30 mph. I have not been ticketed here for speeding, but constantly see others pulled over. It irritates my everytime I see the police hiding there in this obvious speed trap.