A TN. State trooper lies in wait just past where these two routes intersect on route. 45 south. Trooper waits directly opposite Dollar General store in a small group of rundown auto repair shops. The speed limit for this small portion of route 45 is 45 mph. Approx. half mile or so down the road where it devides into a four lane hwy the speed limit jumps to 65 mph. The same applies for a mile or so on route 45 north just before you reach the intersection of routes 45 & 57. There is a traffic light at this intersection.