I think the answer to your question doesn't seem like an answer but here it is -- stupid people are proud and everywhere. I live in Central Texas and we have numerous times during the year where flash flooding is not only likely but happens all too frequently. We also have numerous low water crossings that look deceptively safe. Our state spends a nice sum on advertising to warn people, if you see water in the road, turn around. Yet our state spends a nice tidy sum year in and year out to rescue the stupid. They ignore TV and radio spots, and newspaper stories and warnings. They ignore signs posted right in front of them. They even ignore barriers put across the roadway where the water is clearly rushing across the street. One lady was recently arrested for child endangerment for going around the barriers then needing rescuing with a young child in the car. Her excuse was, "I didn't think it was dangerous."

I'm sure the signs in your area seem worthless and hopefully they are but never underestimate the stupid and their ability to ignore everything safe, sane and logical when even the most unlikely thing happens.