What does a taxiway directional sign indicate when turning onto a taxiway?

The correct answer to the question about taxiway directional signs is focused on the function and purpose of these signs in airport operations. Taxiway directional signs are specifically designed to provide important information to pilots regarding the pathways they should follow while taxiing on the airport surface.

When turning onto a taxiway, the signs typically indicate the exit taxiway's designation and the direction to follow. This is crucial for navigation, ensuring that pilots can easily identify where they are and where they need to go next, particularly in complex airport environments where there may be multiple taxiways and paths intersecting.

This functionality contrasts with the other options provided. The direction to the take-off runway is indicated on other signs specifically for that purpose. The nearest fuel station and distance to the runway are not the primary functions of taxiway directional signs, as they do not provide distance information or fuel locations directly related to taxiway navigation. These signs streamline airport operations by enhancing clarity and safety as aircraft maneuver on the ground.