I used to live in Las Vegas, NV. A major road there, Charleston Blvd, dips low under a RR trestle. An average rain will fill it up (no drainage), so there are very large markers on both sides, a ruler with big numbers showing how deep the water is in feet. They are easily visible on the approach to the Dip, but people keep driving into the deep water. Many of them are residents.
Stupid is as stupid does.
Sue