I was driving to work today, slowing down to stop at a stoplight on a 4 lane road, no one in front of me, and the collision warning alerted suggesting that there was a car there. There were some cars executing a left turn crossing in front of me, but they were quite far away. The only thing I could think of is that the 2 red stoplights made the car think there were brake lights illuminated in front of me. Very strange...