Comment 9 for bug 734193

>but aren't most rivers "flat" so that thnere will be no difference in height from one side to the other.

The initial idea was to replace the normal 1-tile roads whereever they span "unpassable" terrain.
So we are dealing with swamp, ice and even lava (maybe) as well.
And the latter typically are not so flat.

I was having a go already at some mockup (creating a bitmap as an SE->NW-footbridge) and
pasting that over a screenshot.
So far I could not come up with anything convincing, but we'd need to see a worker actually pass
such a footbridge.
So, if someone could program the game logic with a placeholder (make that 6 placeholders!)
I would have a much better chance to find something that works graphically (hopefully).

When speaking about a "longer bridge", I was thinking about 2-5 or 6 tiles.
I do no know what the progress is for seafaring - but I think Nasenbaer works
mostly on "intercontinental" ships, not on small rowing boats.
If we get such small boats, I'd vote for limiting "longer footbridges" to 3 tiles (or even drop them altogether)
If not, we may want longer ones.
We should all be aware of the fact that (rowing) boats and footbridges may ruin the mapmakers' intentions
for some maps, by granting access that is not intended.
So, it may a wise move to think of counter measures that can be used to repair the maps.
(Cliffs, or extended bogs that prevent footbridges _and_ getting in/out of rowing boats.)