Walking doesn't bother me either. I've always been afraid of how I would GET OUT of the car if it went over. it's not exactly something you practice, you know? Like "Ok class, today is "Drive off a bridge and get out of a sinking car" drill day!
But I did the Royal Gorge bridge walk with no trouble...swaying and everything...when I was a kid.
Grama had to *drag* me out on that Royal Gorge bridge! I hated it! I was just terrified! LOL
It's a couple hundred foot fall.... I'd recommend not going over at all, you aren't gonna survive the impact. ;~D