Bad driver
Cahir, you have my sympathy. I am not making little of the aggravation that this caused you, but I want you to consider this:
Is stress mainly caused by the situations that we come across each day, or is it mainly caused by the way we respond to them?
This may seem like a facile question, but the fact is that you can do very little to control other people's actions. You can however, do a lot (one step at a time, and it is a never-ending process) to alter the way that you allow things to affect you. If this incident bothered you so much, is there a danger that you are inclined to let things get to you generally? You are entitled to live a life free of worries such as this.
And by the way, in case you think I am being smug, I am every bit as bad - I often wake up remembering something I need to get done at work and unable to get back to sleep. But I try to change; and you should too.