[Gambet]

Couldn't you just use drawoverplayer() and dontblock() whenever the player tries going under the bridge? Make it clientside so it doesn't affect anyone else. You could also change the alpha while the player is touching the bridge from underneath for the player to be able to see themselves move around.

You gotta understand that either way you do it you're bound to run into problems because if a player walks under the bridge while a player is walking through the bridge they're going to end up bumping into each other if it's a pk zone (unless you made an elevated bridge at a different z-axis than the player walking under it). This is why most servers with bridges just have the player automatically warp to the other side when it comes to walking under it.