Well, actually, riding in a car is dangerous, especially in the mountains. But of course usually we cope without dwelling on that. I found Xanax to be much more effective than Klonopin when I was in high anxiety. I also brought an engrossing mystery/thriller book--I was surprised I was able to concentrate enough to read, but I could. My other solution would be to take a sleep medicine, if you have any, at a dose strong enough to knock you out (a safe dose of course).