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I suppose they do like leaden allusions to totalitarian regimes...
... which those signs, arguably, are not? They're an allusion to the post-war occupation of Berlin, and only one of the four powers involved was totalitarian. Or would you call the occupation totalitarian in itself? The stunt seems to me to be about the restriction on freedom of movement that some people think modal filtering represents.
Oliver Schick-
I suppose the direct comparison between checkpoints and modal filtering hadn't occurred to me. Given that Checkpoint Charlie was probably the most famous border crossing into and out of East Germany of the cold war, I think the link with totalitarianism is arguable at least; IME anti-LTN types like to conceive of cyclists and 'the cycling lobby' as a malign totalitarian force, out to crush their freedoms.
Thrustvector
Actually producing and putting up sector signs (grammar quibbles aside) displays a greater level of surreal wit than I'd normally credit LTN opponents with, though I suppose they do like leaden allusions to totalitarian regimes...