Somehow, everyone forgets this: http://www.youtube.com/watch?v=Vx2L9g0reNo http://www.youtube.com/watch?v=Vx2L9g0reNo or this one caused by texting and driving:

Somehow, everyone forgets this: http://www.youtube.com/watch?v=Vx2L9g0reNo http://www.youtube.com/watch?v=Vx2L9g0reNo or this one caused by texting and driving: http://www.youtube.com/watch?v=oC85prQKFrU http://www.youtube.com/watch?v=oC85prQKFrU It's possible that Project Glass glasses could obscure your vision or distract you, but somehow I don't think it's as bad as actually moving your entire visual field into your groin. Also, the software could help mitigate this issue by a) detecting when your speed (via GPS) is high and disabling any dialogs that overlay the center or b) just keeping most of the overlay up in your peripheral vision. It is also unlikely these things will always be recording everything due to battery life alone. Best case, they sleep until woken up by notification, alarm, geo-fence, or some other sensor. But recording video non-stop? Maybe you'll get 1 hour of battery. Most of the concerns I'm sure are being considered, as well as issues people haven't even raised, like long term biological effects. Google is not run by idiots.