Final answer:
If turn signals fail, use hand signals to communicate your intention to turn with other road users.
Step-by-step explanation:
If your turn signals fail, you should use hand signals to indicate you are turning. Using hand signals is a universal method to communicate with other drivers on the road about your intentions when your vehicle's turn signals are not functioning. It is important to remember that neither your horn, headlights, nor emergency flashers are proper substitutes for indicating turns. The horn is used to alert others of your presence or danger, headlights are used for visibility, and emergency flashers are generally used to indicate that the vehicle is stopped or having some trouble. Hand signals are made by extending the arm out of the window and using specific gestures to indicate turning left, right, or stopping.