As per the title, I'm curious if anyone has tried it out before. Since bridges have their own routing data independent of the terrain and routing paints, can bridges therefore be used to create a tunnel, provided that both ends are above ground (and the terrain above it is painted non routable, like painting under a bridge), and will they go through objects that are within the boundaries of the bridge such as the train tunnel entrances from WA?
Is this feasible, or does it create a glitchy mess?
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http://simswiki.info/wiki.php?title=Tutorials:Creating_Sims_3_Worlds
Scroll down to Custom Roads and Sidewalks Tips - No layered roads.
Then there is this little world with a tunnel, but I'm not sure if it works - http://modthesims.info/download.php?t=419136
You could try to place a bunch of objects together to create a sort of tunnel...thinking a row of these arches (forgot the name in caw for them but from Monte Vista).
http://www.volvenomtullarask.com/category/building-2/world-bygland
Nilxis uses the train tunnels to make a tunnel (it works image 3) as well as a road going through a lot (also works image 12). Pics here - http://nilxisdesigns.blogspot.com/2015/05/plavi-raj-english.html
There is this from Tjstreak - https://tjstreakssims.blogspot.com/2011/11/tunnels.html?q=tunnel
https://tjstreakssims.blogspot.com/2011/11/what-can-you-do-with-tunnel.html?q=tunnel
And you have the rock formations that sims can walk under..the opening is kind of skinny so doubt a road under it would look right. http://simswiki.info/wiki.php?title=Sims_3:Content_Lists:CAW_Content_Lists#Rocks