Call of Duty 4: Ladders
The use of ladder Texture is very simple, As it´s name says, it could be used in places where you want the players being able to climb up.
can be used in Ladders (Of course), Trees, ropes, Tubes or vertical pipe lines.
This is an example using it for a ladder.
Try to make the brush a bit higher than the model (Ladder) you´re using, this will help the players to reach more easy the top of the level.