In most jurisdictions, a note could be put on the driving record. If a pattern on aggressive driving were to be established, a prosecutorial or civil suit effort would have an easier time of litigating against that driver.
In my case, yes, there was paint damage from my bike, which would be evidence.
Edit to add: this was a bit before camera phones.
This response is so boot-lickingly simplistic and lacking in context and nuance. I wish I could get to live in the world where this blanket statement just made everything okay again. It’s almost as if you actually have no reasonable counter to the points raised by the commentor.