Bankety Bank

Caught in the headlights returning home on Tuesday night. I've never seen this sign before, and can only assume it was meant, along with a others strung out down the lane, as a safety instruction to workmen. Except that neither roadworks or roadmen were in evidence. And so the mind starts playing games about what one's supposed to do, and where does one find a banksman at this time of night. And do I have to reverse, or is that backwards thinking?