What does the car driver's hand signal tell you about?

Explication

Raising an arm upward warns other road users that the driver is slowing or stopping. This differs from turn gestures: an arm held straight out sideways indicates a turn toward that side, while a sideways arm bent upward at a right angle indicates a turn toward the opposite side. Because the arm here rises directly from the window rather than extending sideways first, it is not the gesture for a turn toward the passenger side.