Huh? Radio frequencies? TCAS? Sun glare? Transmissions stepped on or clipped? Various procedures? You're all kidding, right?
The phrase "cleared to cross" was never issued and thus was never heard.
If ALL pilots on the flight deck have not heard and confirmed the phrase "cleared to cross", you don't cross. Period. The end.
Presumed, assumed, expected...... for heaven's sake.
What in hell ever happened to airmanship in this profession?
And a checkie in the right seat too......