At an intersection, even if the traffic light is green, **you must stop if a traffic officer orders you to do so**. This is because the instructions of an officer take precedence over any other traffic signal, including traffic lights.

- **Traffic officers**: They are the highest authority in traffic regulation. Their instructions prevail over signals and traffic lights. If an officer indicates that you should stop, you must do so immediately, even if the traffic light is green.

- **Contradictory signals**: In situations where there are signals that may seem contradictory, such as a green traffic light and a stop sign, the indication of the traffic light should be followed. However, this does not apply if an officer is present, as their instructions are prioritized.

Therefore, always follow the instructions of a traffic officer, as their role is to ensure the safety and flow of traffic in situations that may not be fully covered by automatic signals.