but what I thought I saw was more like this
This naturally got me thinking -- "Wouldn't it be cool to use the same trusses that support a bridge to also support a roller coaster? I wonder if this has ever been done?"
Well, I found no evidence that it has been done, which is hardly a surprise. It would be outrageously cool and could be the signature piece of the town that had it, but that is really the only thing it has going for it.
- Bridges are not infrequently hit by barges. This could have disastrous consequences for a roller coaster on the bridge.
- If the coaster cars became stuck at the top, a rescue could really only be attempted from the surface of the bridge, and it would require closing the bridge.
- Drivers would be distracted, and perhaps dangerously startled, by the roller coaster.
- Objects thrown or accidentally dropped from the roller coaster would present a hazard to drivers.
In spite of all the good sense arguments against it, I'd still like to see someone build one.