Under what condition can you cross runway hold lines or taxi hold positions?

The ability to cross runway hold lines or taxi hold positions is strictly regulated to ensure the safety of all aircraft and ground operations. Clearance from Air Traffic Control (ATC) is essential before crossing these designated lines because they are intended to prevent accidents and maintain the safe flow of air traffic.

ATC provides instructions based on real-time information regarding aircraft movements, ensuring that no conflict arises when you are moving onto or across active runways or taxiways. This protocol is especially crucial in busy airports like YVR, where multiple aircraft and vehicles may be operating concurrently. Therefore, obtaining clearance from ATC is the proper condition to guarantee that your movement doesn't interfere with other aircraft in the vicinity.