unless you want units to be able to walk above it you can just change pathing, there is no way to make both ways (up and down) walkable at the same time
1. Change the needed bridge's pathing to 0 2. Create a model similar to bridge, but using a transparent(no texture) texture. 3. Create a bridge with that model (it must have pathing) 4. Create two regions at two sides of the bridge. 5. Then trigger when player unit enters a region, create via GetLocalPlayer() player-local bridge. Player unit will walk on it, and other will go under. __________________________ But that's a theory. GetLocalPlayer() is a desync friendly func, and may lead to crash. I was unable to test this in multiplayer. Also note that you'll be unable to cause two of your units go on and under the bridge.