The thing I don’t like about that design in that it looks like it would be easy to just throw a rope over the top and tie it off to one of the slats at the bottom, then climb up the rope.
“The thing I don’t like about that design in that it looks like it would be easy to just throw a rope over the top”
There is no stopping rule, if the requirement is to prevent any crossing. 100 foot wall - 101 foot ladder.
This design eliminates unaided climbing, and the kind of pole or tree climbing gear that is available.
Ropes remain something that is just infeasible to defeat 100% through height, or with a solid wall. An accomplice can secure the other side, you could use a hook, you can launch rope with a slingshot device, or launch a small weight on fishing line to use to pull the rope over).
Testing of prototypes revealed that the 30 foot height is very difficult to get a rope over by hand however. The over-sized barrel top makes it very hard (and dangerous) to get over, even if you make it to the top with a rope.
FR Help to Criminals Department