What is the meaning of a red arrow at a traffic light?

Answer: D — Must stop and wait for the green arrow to appear

A red arrow at a traffic light means that drivers must stop and wait for the green arrow to appear. Unlike a solid red light where drivers can sometimes turn right after stopping, a red arrow specifically indicates that drivers are prohibited from making the indicated movement (in the direction of the arrow) until the signal changes. This is crucial for safety as it helps regulate the flow of traffic at intersections.