You can't have units on and under at the same time.
However you can make a trigger that moves the unit to the other side (either on the On Bridge or on the Under Bridge, w/e)
Or you can make a trigger that (if you have the normal walk over bridge as a normal setting) detects when a unit is near the bridge (the way that goes under it) and then remove the pathing. Now he'll walk under it and after he's gone place the pathing again. Note that this is very hard to detect and won't work if there's more units at the same time going over and under etc...
why not make units Flying when the go over the bridge so basicly a non path blocking object is used for the bridge so its in midair and units can go under it as well?
add storm crow form (it just needs to be there, u dont need 2 use it), then change fly height via triggers, and remove the spell, when a unit enters a bridge, and then do that again when they leave the bridge
Waygates on either side of the bridge. Bam. Sure, flying units will move kinda instantly across there, but you can keep your pathing and when you right click, going under the bridge becomes a viable option.
I cant remember where i saw this, but some guy did use elevators for bridge..
you were able then to run under and over..
probly take some time to make it nice tho, he used elevators fences etc - but it looked pretty good.. cant remember which map this was, but soem kind of escape
I'm on a page about incorrect corrections, and spent the better part of like two hours trying to get someone to understand that -5^2 = -25, not 25, and then that post had comments get reposted because that group is self sustaining, and that person was in turn trying to explain what I just explained to them. And I'm taking that as a victory
I will be AFK for a couple of days you guys hold down the fort while I am gone. I will be checking in on my phone but that will severly limit me. Be back saturday!