There are some awful drivers out there...that's a fact. I have had many near misses from people not paying attention, breaking the highway code and often the law. The worrying part is that if they crash into me and there are no witnesses, it could be my word against theirs. I want some proof of innocence (when it isn't my fault!!) I have looked at a few, but want some real world feedback on these things. Anyone have one or seen one in action?