On the way to work today, which is normally only a 5-minute drive for me, there was a small fender-bender among a couple of cars. The cars did exactly what you are supposed to do: they pulled off the road into a nearby parking lot so they would not block traffic. The police could not be bothered, and just parked in the right lane, jamming traffic up for a mile or so. I looked - there was no debris or anything in the road that they were trying to block (you can confirm that from the picture below), the police simply did not have the common courtesy that the other drivers had.
Yes, the police car below is actually parked and unoccupied in the right lane at morning rush hour. The citizens involved can be seen pulled into the parking lot at the left. Though it is hard to see from the picture, the traffic backup extends well into the distance.