Yes.
Hand signal: put your arm straight out of your left hand window and fix the light before a cop sees it
just turn your arm left but not all the way you might break it. It depends which country you are in and what side of the road. In the USA, it's simple, arm straight out of the drivers window. In the UK, where you are sat on the right side of the car. With your arm out the window, make a circular anti-clockwise motion using the whole arm. As if it's an invitation to those following, to pass down your righthand side, as you are going to turn.
stick your left arm out of the window
Well, if you have turn indicators it'd be better if you used them. But if that's all you've got it's usually OK.Added: YES, that is the correct hand signal.
Left arm out the window, bending 90 degrees straight up at the elbow, all fingers together pointing straight up.
stick your left arm out of the window
Hold the arm straight out.
straight left arm out of the driver seat
. . . be making a left turn.
A line extending from the upper left to the lower right has a negative slope.
A line extending from the lower left to the upper right has a positive slope.
centrifugal force