No, you would never even desire to learn the process you would have to gio through to attach something to a government owned guard rail -- i.e. you need engineering drawings done, traffic studies done, looking at buying approved materials with DOT ratings, going before a committee for approval, etc... If you do attach something to the guard rail without permission you will find that it will be mysteriously gone one day and zero sympathy about it when you call to find out what happened to it...
Learn how to back into your driveway or widen it to allow you to turn your vehicles around before stopping to pull onto the road way...
~~ Evan