However, there are some exceptions to this rule. For example, in some states it is legal to stick your hand out of the window to signal a turn or to indicate that you are about to stop. In addition, some states allow you to stick your hand out of the window while driving in a school zone or when you are stopped at a red light.
If you are caught driving with your hand out of the window, you could be ticketed and fined. The fine for this offense can vary from state to state.