[lra]

BENT 8, not a criticism, but your employer rules can be more stringent and explicit than State rules.
As a NSW ex- bus driver, or rules were..
No incoming calls to be taken.
If you had to make call, park the bus safely, neutral, park brake on, engine stopped, get out of driver's seat and make call while standing on the front step.
Failure to comply = instant dismissal, and there were dismissals which the Union backed up, no running to the Union rep with tears and sad stories.
But personally, I can't see the difference between that, and using our 2 way radio, which was allowable.