Sounds like you did not quite have Critical Mass. One big vehicle could waste 12 cyclists. Please when you say I use caps. Check some of the other threads on BF a number of wearable video systems are described. The vehicular harrassment should be filmed. Otherwise it is just your word against theirs if anything happens. TV stations might like to have a feed from your camera. Some of the video systems are small enough that police that try bullying you won't see them and you can show the tapes later in court.