What must drivers do when an arrow shows both left and right?

When an arrow shows both left and right, it indicates that drivers have the option to turn in either direction where permissible. This signal is designed to give drivers the flexibility to choose their path based on traffic conditions and applicable road regulations. It is important for drivers to ensure that they are complying with any other pertinent traffic laws, such as checking for pedestrians or yielding to oncoming traffic. Understanding this helps maintain smooth traffic flow and ensures safety at intersections.

The other options suggest scenarios that do not apply when faced with this specific signaling, as stopping for a green light or being limited to only one direction contradicts the meaning of having both directional arrows visible.