Final answer:
At an intersection, if you encounter a red arrow, you should stop and not proceed in the direction of the arrow until it changes to green.
Step-by-step explanation:
In the case of a red arrow at an intersection, it indicates that you must stop and not proceed in the direction of the arrow until the arrow changes to green. The purpose of the red arrow is to control traffic flow and prevent any accidents or conflicts with vehicles moving in other directions.