We were on a three lane highway with a police car all the way on the right while we were all the way on the left... there were a few other cars around. The police car goes into the middle lane about 4 car lengths in front of all the other cars and flashes its yellow lights for less than two seconds. Then the police car speeds up and moves towards an exit, stopping inbetween the exit and the highway where the water barriers are and shines a bright light across the highway... I'm pretty sure the light was focused on our car for a second or two. What the hell was going on? Did we do someting wrong. We were all like WTF does a yellow signal mean.