600 here. I could be in trouble venturing into unknown territory on the highway without a navigator. Couple things the test didn't cover were common sense things like, pull over if you are nodding off, or if it's raining too hard to see (fog included), and don't allow your gas tank to run empty. Range on my car is about 350 miles.
And by all means, become a member of AAA. They've helped me out many times, and the membership is well worth the asking price.
*Interesting note: never, ever, ever pull over on a bridge or elevated interstate shoulder unless you have to. If you see blue lights behind you, wait until you are off the elevated part to pull over, even if it means going several miles before stopping. Pulling over under these circumstances (on an elevated highway or bridge) is extremely dangerous for you and the police officer.
Les