ATC may only issue crossing instructions for one runway at a time unless what is true?

In air traffic control (ATC) operations, crossing instructions are issued to manage aircraft movement on runways safely. The requirement for conditions under which ATC may issue crossing instructions for multiple runways is related to the physical separation between the runway centerlines.

When runway centerlines are less than 1,000 feet apart, it is permissible for ATC to issue crossing instructions for more than one runway at a time. This reduced distance allows for more effective management of aircraft as they can safely operate in close proximity to one another without creating a significant collision risk. The standard procedures are designed to ensure that any potential conflict in aircraft movements can be mitigated through strategic sequencing and communication.

In this instance, other options do not provide the requisite conditions for issuing such instructions. Runway police presence is unrelated to ATC's decision-making regarding runway crossings, while distances less than 500 feet would not meet safety protocols typically observed in aviation practices. Similarly, stating that runways are active at the same time does not inherently justify issuing crossing instructions for multiple runways. Therefore, the correlation between a runway centerline distance of less than 1,000 feet and the approval of simultaneous crossing instructions underscores the importance of maintaining safe operational standards in air traffic management