Final answer:
When a policeman motions you to go through a red signal light at an intersection, you should follow their direction.
Step-by-step explanation:
When approaching an intersection where a signal light is red and a policeman motions you to go through, you should follow the direction of the policeman. Even though the signal light is red, the policeman's indication takes precedence over the signal. This situation may occur in cases where the policeman is directing traffic due to an accident, power failure, or other reasons.