2012 Toyota Prius Owners Manual - Page 486

2 -1 . Driving proc e dure s Tur n signa l leve r The turn signal lever can be used to show the following intentions of the driver: Right turn Left turn Lane change to the right (push and hold the lever partway) The right hand signals will flash until you release the lever. Lane change to the left (push and hold the lever partway) The left hand signals will flash until you release the lever.