Commuting since 1982, I have yelled at my share of dangerous motorist. Even with taking the same route and seeing those same motorist, all but two changed their dangerous behavior around me. Having a video camera works even better, just showing them the camera changes their behavior without saying a word.
The two exceptions:
1. A hit and run driver who decided to try and intimidate me from testifying against him and just wanted to get back at me. He went so far as filing for a protection order, both to try to intimidate and to get most of his legal fees from me. He pleaded no contest on the hit and run (same as guilty in the courts eyes) and he lost the protection order case. Meant he had to pay the lawyers at least double the amount. His then 9 year old son at the time at least learned from the experience, years later as a high school student, he gave me a shaka sign (thumbs up) as he passed by.
2. The guy was a 33 year old mentally ill man, allowed to run loose. His arrest for his actions against me cost him his job and he did get convicted of terroristic threatening. I learned later, that years before at the age of 18, he was convicted of assaulting his grandfather who was raising him and his grandfather had to take out a protection order on him, which he violated.
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Land of the Free, Because of the Brave.