This is a (playable) landscape to show how you could use "sidewalks", which can be tricky. I made use of them in abundance by prebuilding a few larger port cities.
The landscape has no mods apart from the sidewalk you can find here: http://www.tt-forums.net/viewtopic.php?f=40&t=52510
Yes, the idea is more experimental, for a full experience with peeps you better play a game like rct2
In very rare situations you can see locomotion crashing too, if you try to delete a piece of a wide curve of a sidewalk, after it has been "mutated" while you are playing like on this screenshot.
One thing which may be interesting to play is that towns can regress if you don't establish a good passenger network.
love the idea of sidewalks but one problem. Shouldnt sidewalks be half the size of the roads cause to me it looks to big but other then that I think its good idea and i will be defintly be using it in the future.