Bridges, but it's a fear I'm working on.
When I drive through Portland, OR I will deliberately take the Fremont Bridge:
instead of taking the Markham Bridge:
even though it means detouring off of I-5 on to I-405. Why? Because I also fear being caught on a bridge during an earthquake. The Fremont is constructed to give and sway during an earthquake, and the Markham is not. The Markham will most likely buckle and crumble. Plus, the view from the Fremont is prettier, and the Markham is almost always clogged with traffic. I would rather be stuck on the Fremont than the Markham, if I have to be stuck at all. I've been stuck on the lower deck of the Fremont often enough now that I'm less frightened of bridges than I once was. The ultimate test was a few years ago when I went to San Francisco on spring break and walked to the middle of the Golden Gate Bridge. Scary, but also really cool, and the view is certainly unique.