What does Sign O4 warn drivers about?

The correct choice highlights that Sign O4 is indicative of a traffic light or robot ahead. This sign serves an essential function in traffic management, alerting drivers to the upcoming presence of traffic signals which regulate the flow of vehicles and pedestrians at intersections. Understanding this warning is crucial for safe driving, as it prompts drivers to prepare to stop or proceed according to the traffic light's indications.

In driving scenarios, recognizing such signs helps in anticipating changes in driving conditions, allowing for better reaction times and promoting overall safety on the road. Being aware of the presence of traffic lights is particularly important as it also indicates potential pedestrian crossings and the need for caution, further emphasizing the relevance of this sign.