(n.) One who meddles with, or intrudes into, the affairs of others.

Dutch uncle Paul Pry Polonius Sunday driver admonisher adviser bus driver busman busybody buttinsky cabby cabdriver chauffeur confidant consultant counsel counselor driver expert guide hack hackdriver hackman hacky hit-and-run driver instructor intermeddler jitney driver joyrider kibitzer meddler mentor monitor motorist nestor orienter preceptist prier pry road hog snoop snooper speeder taxidriver teacher teamster truck driver trucker truckman yenta