Don't walk by.

Photographed outside a building-site (now a car park) in Barrowford, North-West England. The sign was on the outside of the site, on the public pavement (sidewalk). I think it was intended as a warning to the people working inside, not pedestrians on the outside. It doesn't seem to make much sense otherwise, as none of the construction work was anywhere near the fence and "walking by" is the only thing you can do here.
Camera: Sony RX100. Processed with Nikon Capture NX2.