I believe him when he said that he did not know what the flashing lights meant.. Actually, I was also stopped once by a cop car with flashing lights and I did not know what it meant either.. I thought he was tring to overtake so I slowed down and drove close to the curb but the bas..tard would not go. So I gathered I had to stop to see what was going on. Only then I discovered I was meant to stop. The whole thing happened within like 50 meters so it was not a big deal..