Or they will tell you you're good to go.
Across the street, that is.
If you are confused now, here is the explanation: Traffic lights for pedestrians have been installed in Haddeby, the modern settlement close to Haithabu. Yes, that Haithabu of the viking-age settlement that was excavated years ago.
So now there's a little Viking standing with a round shield for the stop signal, and a green one running, axe at the ready. Hopefully not to kill and plunder the Hedeby museum!
Read the full article (in German) and see the pictures here!