I am afraid of big trucks on bridges. I have no problem with cars, but when I'm on a bridge with a dozen or so semi's loaded with who knows how much weight, I become very uncomfortable. I tell myself that these trucks are on these bridges all the time and the bridges don't cave in. It still doesn't help. I also don't like it when I'm stopped on a bridge. The bridges move. I've been told that that's a good thing, but it makes me afraid.