I think fences might be useful for keeping motorways from being turned into a city road.
Maybe some tweaks to the dat, so that it can only be built in an offline game, or only by the public player in online would be better.
http://dl.dropbox.com/u/17111233/Player_Colour_Fence.rar
Hmm, I'm not sure whether this can be done to a .dat file...
Hello
I believe that the only way to prevent a user can use the fences in online games is to put their button in the tool reserved for the public service.
Giuseppe
I Think that fence a part it that not for public player reserve can.
A fence can hold away a city from a highway on ground.
I've often wanted a fence function that could be used to stop a city growing in a certain direction.