Imagine a very long bridge (Visbi Bridge - named after the designer) across an immense canyon - really almost a wide deep gorge -use on an earth-like world. My concept is that part of the support of the bridge would be a ballon-like, lighter-than-air technology of some kind. The ends of the bridge would use a suspension set-up, with piers and cables. Out toward the middle, the bridge would need additional support
1.I am wondering if this might be feasible, assuming a somewhat more advanced materials technology than we presently have? Gravity and weather would be the similar to our earth.
2.How long could such a bridge be? 1 mile? 2 miles? 5 miles? Assume advanced materials that are at least conceivable today.
3.Would this concept make sense in opposition to flight? In other words it would have more capacity for the energy consumed.
4.Are there other technologies that would realistically allow very long bridge spans?
On this world, the technology is close to what we have. The civilization on this world is less energy intensive than ours, is not car-based and is more sparsely populated. I am ruling out anti-gravity technology or energy bridges, etc. This bridge would not have to bear enormous loads, mainly people in some sort of vehicles and valuable/light cargo. I assume provisions for closing the bridge and/or reconfiguring the bridge structure in unfavorable weather and wind conditions.