A little late, but I think I know. Or rather, something happened over here a few weeks ago that might explain it.
In this case, there was a car chase on the highway. Some punks stopped at a gas station and drove off without paying for the refueling. The police noticed it, went after them and gave them a stop sign, which they ignored. They tried to outrun the cops by speeding up a lot. The police then created an artificial traffic jam in order to force them to stop. Unfortunately, the thiefs were driving reckless, ramming several cars and finally crashing into another car, killing one of it's passengers. It was quite unsettling, particularly since car chases like this hardly ever happen here..