alt Hacker NewsThat depends on you definition of “flood”. But here we’re just talking about dangerously flooded roadways, and in many parts of the US those happen multiple times per year. Definitely common enough that you can’t just shut down your fleet anytime there is a danger of it happening.
My experience with them is they only last a short time, and there is almost always an alternate route so you are not shutting anything down, just slowing things down a little.