shocking footage has emerged of three young thugs threatening a driver .
the red ute appeared frustrated as they attempted to overtake a slow car .
when the ute pulled up in front of another car , three people got out .
an armed woman was seen stabbing the car 's bonnet on a melbourne road .
the ute driver has been suspended for 12 months and hit with a $ 2000 fine .
police are investigating the woman who was armed with a weapon .