I don't know. I've talked to quite a few people and most of us are using it during driving (or, more accurately, wearing it, since the screen is off UNLESS you have it come on).
I think banning wearables at this point is INSANELY STUPID. Why? It's easy to see that it's safer to use Glass for, say, maps, than looking at any screen on your dashboard. So, why would Glass be banned and not your incar navigation?