Use check-back communication to confirm a safety-critical movement authority.
Signaller Noor N Route control ID Identify RB Read back CF Confirm The moment 20 sec Degraded working radio call You are Driver Ellis at Signal M42. The radio clips as the signaller gives authority to pass at danger under a temporary procedure. The risk is not that people do not care. It is that clipped audio and similar identifiers can make two careful people hear different instructions. 2 similar signal IDs 12 sec read-back time
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