How should a motorcycle driver signal a left turn maneuver?

Explanation
A motorcycle driver who wants to turn left should first make sure they can make the turn safely and that traffic on the road permits it. Once they have checked this and before starting the maneuver, they should signal their intention using the left turn signal light or, failing that, with the arm extended out horizontally with the palm facing down.
Do you want to do the
official exams of the DGT?