One eyed trouser snakes, presumably?

Fed up with motorists stopping to urinate by the roadside Austrian officials have put up fake snake warnings to scare them into using toilets."The idea is that people stop to relieve themselves, see the warning about snakes and get back in the car instead of going to the bushes to take a leak," said Franz Perder, manager of a motorway restaurant in Guntramsdorf where some of the signs have been placed.

"Of course there are no snakes but they don't know that.

The warnings have worked really well."

Hat tip: Arbroath