It has nothing to do with pathing, you need to make the bridge a destructible and set Walkable to True and the Pathing to none.
Comments
8
Try adding pathing blockers under the bridge.
how does the pathing work, cause when I change the bridge model to this, my people fly through the bridge 
(could have guessed this would happen, but I don't know how to solve)
(could have guessed this would happen, but I don't know how to solve)the bridge is lovly and small size.
although i havnt tested it, units will still walk on it by its shape right?
although i havnt tested it, units will still walk on it by its shape right?
a nice clean bridge 4/5 
Nice bridge, looks good for cinematics 
I think it's really good, It's nice to actually have a good looking bridge for a change.
I personally like it