What should a pilot do when approaching taxiway holding lines with a solid line?

When a pilot approaches taxiway holding lines marked with a solid line, the correct protocol is to not cross these lines without receiving explicit clearance from Air Traffic Control (ATC). The solid line serves as a visual indication that the pilot must stop and wait for authorization to proceed. This is an essential safety measure designed to prevent taxiing onto runways or into areas where other aircraft may be operating, which can lead to potentially dangerous situations.

Maintaining this protocol helps ensure safe and orderly airport operations, reducing the risk of runway incursions and ensuring that all aircraft follow the established communication and procedural standards at busy airports. The requirement for clearance emphasizes the crucial role of ATC in managing air traffic and ensuring that all movements on the airport surface are coordinated.

While consulting with other pilots may provide additional situational awareness, and notifying ground control of intentions can be a good practice in certain contexts, these actions do not replace the necessity of adhering to the regulations surrounding holding lines. Proceeding without clearance disregards the established protocol and increases the risk of mishaps on the airfield.