What is the purpose of a "Hold Line" at YYZ?

The purpose of a "Hold Line" at YYZ is to indicate the point where vehicles must stop before crossing a runway or taxiway. This safety measure is crucial in maintaining a clear separation between aircraft movements and vehicular traffic. When approaching a hold line, vehicle operators must come to a complete stop and ensure it is safe to proceed. This helps prevent potential collisions between vehicles and aircraft, thereby enhancing safety on the airside.

Hold lines are typically marked with specific visual cues, such as solid and broken lines, which differentiate them from other markings on the surface. This distinction ensures that drivers are aware of their responsibilities and the critical need to adhere to these lines, particularly in busy environments like airports where the margin for error is minimal.

The other options do not accurately capture the role that hold lines play. End of runway signals, designations for parking areas, and speed limit signage serve different functions within the airside operational framework, but they do not involve the direct stopping requirements that hold lines impose on vehicles approaching runways and taxiways.