repetitive buzzing noise under drivers side
 

A Few Days Ago My 07 Prius Started Making A Buzzing Sound Under The Drivers side Of The Car. It Turns On, Buzzing FOr About Three SecondS, ThenTurns Off For A Few Seconds, Then Back On Again. It Continues As I Drive. When I Shut The Car Off, It Continues For A Little While And Eventually StOps. Any IdeasOf What This Could Be?