Straight lines is quite easy to climb over. But something like a thick jacket or a carpet over it and you can with relative ease get over it.
Lops extend out to away from the fence that made it hafer to cross, you can do that with straight wired in a Y shape too but less efficiently. Coils with multiple connected stands will not easily collapse and there is not a single straight line that can for example hold up a carper. So getting over them is harder
Any razor wire on a fence is to make climbing over it harder. If you just want to stop someone who is honest from going somewhere the should not by mistake the razor wire is not required
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