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I remember when I lived in North Carolina, I was driving east on I-40 after Memorial Day weekend. At one point, we passed a state trooper who was parked on the shoulder (maybe it the median, I don't remember) with his car facing traffic. At first I thought that was odd. About a mile up the road, I saw six cruisers lined up on the shoulder, all facing the right direction. Just beyond them were several more officers who had puller drivers over and were issuing tickets. I noticed the same phenomenon across the median in the west-bound shoulder. Another mile up, I saw a lone trooper facing east in the west-bound shoulder. That's when it all clicked...

The lone trooper was running radar and getting the plates on speeding vehicles, then radioing ahead to the group of troopers. The troopers up ahead would then take turns pulling over the offenders. After writing a ticket, the trooper would continue up the road to the next the get off, turn around, and work the other side of the road. Lather, rinse, repeat.