It's pretty simple actually 4.4 Obstacles - Player built obstacles that impede player movement are not allowed. This includes obstacles that slow the player, force the player to crouch or force the player to jump.

Something like this should be the easiest judgment call of any LT ever, if it makes you jump/crouch in any way it isn't allowed and you make the person change it or delete if they refuse, what has the server come to that LT don't even know this just blatantly bread obstacles rule. God damn, I need to make a come back.

EDIT: There's a huge difference in making the bases that have the big ass crates fall to block movement once you tgun it and purposely putting a keypad, which I believe if I remember you cannot destroy with any special weapon, in the walkway to purposely impede movement. That creates a completely unfair advantage and attempts to completely loophole the obstacles rule.