[jawns]

The law (at least in my state) holds the truck driver responsible for what is called an unsecured load. Meaning if it is unable to be driven without stuff flying off it, it shouldn't be on the road. The signs have no legal significance.

Do I drive closely to dump trucks, though? Nope, I keep my distance. They might be responsible for the damage, but I don't want to deal with a broken windshield in the first place.

[msla]

Some people really need to internalize the fact that anyone can put up a sign, and signs don't make the law.