Beware

This oddity was turned up by my old Oxford pal and Websurfer extraordinaire, 'Keith Tolstoy', some time ago. I assume it's a road sign advising of the hazards of 'concealed entrances' opening on to the main road. Well, what else could it be? A wonderfully warped warning!

Of course, for me it suggests something else entirely. And the caution is timely.