Is it permissible to authorize aircraft to line up and wait simultaneously on intersecting runways?

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Managing runway occupancy and sequencing is crucial when runways intersect. A line up and wait clearance places an aircraft on the runway ready for takeoff, effectively occupying that runway segment. If two aircraft were allowed to line up and wait on intersecting runways at the same time, their paths cross near the intersection, creating a real risk of runway incursion or collision due to timing uncertainties. Because of that safety risk, it isn’t permissible to authorize simultaneous line up and wait on intersecting runways. Instead, controllers sequence one aircraft to line up and wait on its own runway and manage the other aircraft with appropriate hold-short or separate clearance until the intersection is clear. The question isn’t about daylight or conditional clearance—the safety constraint of intersecting runway occupancy makes simultaneous line up and wait unacceptable.