John Dingell Drive Tunnel, both tunnels north and southbound. Lights in the tunnel are off in the northbound tunnel (east side tunnel) on purpose making it pitch black. An airport police cruiser, pitch black tinted windows, no lights will be parked on the left shoulder, further up. He will get you as far as 600 to 1000 feet prior to entering the tunnel with radar. He is in the vehicle turned around pointing the radar. Limit is 45 and if you are over that prior to entering the tunnel, you will be pulled over and fined. Set cruise control below 45 and have camera on.