I'm wondering if any research has been done into the relative demands of simplex vs duplex communication? The kind of thing I mean:
Go to X and meet Y, then proceed to Z. Over.
Received. Out.
As opposed to:
Look, I'm going to be a bit late tonight, because ...
... not again ...
... yes, sorry, but there's a project I need to finish ...
... you said that last time ...
... yes, but ...
... and who is staying on to help you with it?
... well, it's Emma, actually, but ...
... I knew it! You want to be careful there ...
... don't be ... hang on, there's a roundabout ... bloody hell, where did he come from?
... don't try and lie to me ... Mark? ... Mark? ... Any chance of picking up a pint of milk on your way back? Mark?
I can use two-way radio while driving at work, and it doesn't cause me any concern at all. On the other hand, I know that even hands-free calls in the car reduce my concentration considerably. Nowadays, I put the phone in the boot and I deal with any calls when I next take a break.