The problem of idiots crossing flooded roads is so bad in Arizona, we even enacted the "Stupid Motorist" law. That's not the official title of it, but everyone's been calling it that since it was proposed.
It calls for a $500 fine and repayment of rescue costs for anyone who crosses a barricade or ignores warnings and drives into a flooded road.
The monsoon rains and flash floods make hundreds of streets and roads into rivers out here. Every year there are dozens of these idiots who ignore the warnings and think they can get across.