People drive into water all the time. They see water across the road, and using past experience of the road conclude that the road surface is only a few inches

People drive into water all the time. They see water across the road, and using past experience of the road conclude that the road surface is only a few inches below the water. Better wet than late so they decide to drive through it. Except unknown to them, the water washed out the road and they fall into a trench deep enough to wreck their car or worse. It's so easy to find videos of this online. People should know better but hubris is a hell of a drug. Anyway, I doubt the signs help much.