What does the white guidance line indicate?

The correct answer identifies that the white guidance line indicates wing tip clearance. In airport operations, these lines are crucial for maintaining safe distances between aircraft and obstacles during movements on the ground. The purpose of the guidance line is to assist pilots and ground vehicle operators in ensuring that their aircraft or vehicles maintain a safe clearance from structures or other aircraft, preventing any potential collisions or accidents while taxiing.

This function is particularly important in congested areas where space is limited, helping to guide aircraft along taxiways without encroaching on areas where they could inadvertently cause damage or safety hazards. Understanding the role of guidance lines in relation to wing tip clearance enhances overall operational safety at the airport.