Final answer:
3. Means that you may go in the direction indicated by the arrow. A yellow arrow at a traffic signal means that you may go in the direction indicated by the arrow.
Step-by-step explanation:
A yellow arrow at a traffic signal means that you may go in the direction indicated by the arrow. It is used to control turns from a specific traffic lane. Unlike a circular yellow light, a yellow arrow specifically indicates the direction of travel allowed. Therefore, option 3 - "Means that you may go in the direction indicated by the arrow" is the correct answer.