I hope you got the registration?
Few months ago a van driver cut me up on a circle
He did seem quite reluctant to stop and talk to me, So I followed him until he pulled over and then calmly told him my opinions.
**edit** When I was airing my opinions, he also mentioned that he too was a biker
...at that point my voice tone changed a little
something along the lines of "if your a biker you should know better you *%$@ing c!*t
"