Not good because either 1) you're risking taking one of your hands off the steering wheel to dig through your glove compartment which in turn might cause the steering wheel to veer to the right... oops! Or 2) you're driving blind for who knows how long, because with your luck the one time you want a red light so you can find your glasses you end up hitting all the green ones... that is... if you can see that it's green.

Instead of risking your life why don't you just buy a car visor sunglass caddy? Attach this bad boy to the visor of your car and not only will you know where your glasses are at all times, you'll also have the confidence in knowing your eye-wear will be protected from being scratched or broken with the soft interior lining of the caddy. A slide-on lip safely secures the case to your car visor.