I hate to say it but I really do think, we drivers, are in the wrong on this. I look at this post and see, 'cell phones are ok if you have two hands on the wheel and a headset on...oh, also water's ok too...oh, radios in the cab is ok...' It seems like we're saying 'well this is ok during this type of situation'. I think it's actually a good thing management drew the line at cell phones.
I just picture the driver driving down the road yakking away, fiddling with the radio with one hand and grabbing his/her water with the other...Honestly, it scares me.
On Thurs I had some doofus aggro driver turn left with me. I was in the middle of switching lanes when he guns his engine and almost had me sideswipe him. The idiot was on the cell phone. A little up the road he did the same thing, again!
I will admit, I DO drink water at stop lights to stay hydrated. I find this is a safety concern because one side effect of dehydration is drowsiness. Do you honestly want to have a drowsy driver behind the wheel? I have a radio in my cab but DO NOT touch it on road. Cell phone I will only use if I have a fair distance to walk and am just calling my gf to let her know I'll be home late or during break periods. As far as I know none of it's a safety concern (except for the water which I explained before) as long as you're not concentrating on it or fiddling with it.