Reporting a dangerous driver with video evidence - how ?

[snapper]

"I just find it very sad that someone would drive round in their car with a cam on the dash, then take it to the police when they see something they dont like. I just hope this bloke never drives to any bike meets around the country cos he is gonna have a field day"

have a look on you tube if you havent just search car crash compliation ! youll be there for hours , some of it is so scary , i guess its the latest thing to have a camera on your dash in russia