I noticed a trooper not to far from my house. I got in my car and followed him for 25 miles (Highway). I counted around 40 cars and I only detected him shooting 4 out of the 40 cars of I/0 not more than 2 second blasts. Selective I/O is a bi*tch Average speed of both of us was 45 mph. Tx DPS are excellant traffic readers.