I thought I'd add some pictures to Hobie's observation. 1. As the car takes off, the lightbar becomes loose. 2. The front of the patrol car is just to the right of the tree. I've arrowed the lightbar, which is falling off. 3. The patrol car lands and rolls over without a lightbar. 4. A damaged lightbar is attached to the patrol car when Bo and Luke turn around to check on Rosco. A little later in the same episode, Rosco ends up in the Hazzard Pond. Even before his car hits the water, the lightbar is broken and covered with some sort black material (duck tape?). When Rosco climbs out of his submerged patrol car, the lightbar is pristine and still working. Just before the car sinks, there's a close-up of Rosco which shows that his door mirror has repaired itself!