Hi Ubuntu,
Please PM me your contact details before you drive home today and i'll forward them onto the good people at the Darwin Awards
The Darwin Awards 
I wouldn't do it for a few different reasons. Firstly, you'll probably die. If you're not blacking out or samba'ing then you're not concentrating on the road as you're looking at your watch all the time and generally in a state of distraction and discomfort. You might speed up because somehow that'll help you go for longer. You might not react quickly enough to other traffic or pedestrians. I know a mate who ran off the road after I think it was a small BO whilst driving. He was damn lucky as he doesn't drive slow.
The other reason is that I think it's pretty ordinary training - you're not really achieving much with small breath holds. Much better arriving home alive and giving it a good go on the lounge watching the telly.
I know we all love the ocean and want to do better and all that, but seriously - we don't have to hold our breath everywhere we go!
Cheers,
Ben
Welcome to the forums too! Stick around and you'll learn plenty of good training techniques.
