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Cable & Road Bridge (Expert)

You're going to be awed by the simplicity of the grid-on "canonical" solution: http://i.imgur.com/Gl7o68R.gifv
Ironically this solution doesn't work with under-slung cables added, it needs to flex in order to not break and that means cross cables for springiness (I did come up with a underslung cables solution too just to make sure it can be solved that way)

ha, I was having trouble with non-side solutions. I spent a lot of time trying to minimize the amount of roads because of their weight. Then I realized that I could just redirect their weight into the wall.

Gee bolt, you always make me regret not raising the level up on platforms to prevent using the sides :). (I have two solutions which don't require side supports)

Very interesting concept.
Here is my solution: http://i.imgur.com/FEnGXQ6.gifv