I don’t suffer from bridge anxiety, but I do feel more nervous when I am crossing a tall overpass or bridge when I am high up on a motorcycle than when I’m low to the ground in a car. Every once in a while it occurs to me that I could easily fling myself over the side of the bridge. One reason that doesn’t freak me out is that I’ve always been a strong swimmer, and when I was a child we practiced jumping into the pool fully clothed and then using our pants as a life preserver by tying a knot at the bottom of the legs and blowing air into them. I think if I was flung into the water wearing my motorcycle gear, I could get out of it and either swim to safety or stay alive long enough to be rescued. As long as I’m conscious when I hit the water, I think I would have a fighting chance to survive.
Being low to the ground in a car means you usually can’t see as well over the barriers on the sides of the road you’re on. It also means you have a lower center of gravity. These things should work in your favor.