What does this traffic sign indicate?

You answered correctly. This traffic sign warns drivers that there are traffic lights ahead. It is a standard triangular warning sign with the image of a traffic signal inside, alerting you to watch for changing lights and to be prepared to stop or adjust your speed. Always be attentive near these signs, as the traffic lights may not yet be visible, but are coming up soon. This sign does not indicate a customs post or a level crossing. Recognizing this warning helps you anticipate regulated intersections and stay safe.