You shouldn't be wearing your Glass while driving, and you shouldn't be driving if you're too tired to stay awake. This idea encourages both..
Thanks for the feedback
Glass is actually designed in a way where it's completely out of your line of sight, and just on the outskirts of your field of view. DriveSafe works in the background, monitoring things like your blink rate and head tilt to determine if you're falling asleep, all with the screen being off so as to not be distracting.