I spotted some "things" in the tube station the other day that I've never noticed before. They looked like bicycle reflectors...
Turns out that they are reflectors :) But (and how cool is this?) they are to reflect laser beams and are being used to detect if works above ground are shifting the shape of the tunnels (that scares me just a bit).
I found a WikiMedia file about the emitters, which has solved the mystery of what these things are for me:
Turns out that they are reflectors :) But (and how cool is this?) they are to reflect laser beams and are being used to detect if works above ground are shifting the shape of the tunnels (that scares me just a bit).
I found a WikiMedia file about the emitters, which has solved the mystery of what these things are for me:
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