Comment 1 for bug 734193

I think this sounds great. It would look a lot less out of place than the normal roads currently used. An alternative would be to place the carriers in small boats like Settlers 2 did, but that always seemed a bit odd to me. By using footbridges it also makes sense that you can only build across 1-tile sections of water, and not across vast oceans.

For an implementation two parts are needed:
1. Someone needs to create graphics for the bridge itself.
2. Some check in the code for what kind of terrain the road is on. I assume it can be treated like a normal road, just drawn differently if it goes across water/swamp.

Look at this for build17?