Turn signal: Lights that indicate the direction of the turn the car that is still moving will take.
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They are activated with the lever that is placed on the left side of the steering wheel. They indicate which side our car is going to move to the other drivers. They are important to communicate with other drivers while there is traffic, as they show other our future actions, which contributes to traffic safety.
Some car auto headlights rely on sensors to determine what angle the car is sitting at. If there is passengers on heavy object in the back the light might be pointing to skyward. So if these sensors don't work the lights won't come on in auto at all. There is normally on on the front and one in the back and picks up the compression of the suspension.