Okay. I know you are less than happy with it, but I am impressed by your take on my dream. You are right on the skyline and general direction of road. I was heading West. The road started to change from pavement into the roller coaster tracks. It seems that as the cars were falling off, their aim was North Western view of the Arch and city skyline.
In my dream I could see the bridge getting smaller in the distance as it climbed impossibly higher ahead of me. I also remember seeing the cars in front of me driving and then diving straight off the edge ahead. A couple of cars in various stages of falling. That was the most horrible part. To know what fate befell them and to see what was coming.
Hope this helps. Thanks for sharing!