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All the people on the YT comments talking about extending the cone buffer... unless you extend it over the top of the hill, lengthening will just make things worse. They'll come over the hill with less time to stop before either having to ditch it or veer into oncoming traffic.... And then you have the problem of a single lane cresting a hill, so neither side can tell if they're clear to go. I guess then you'd need a flagger for sure.
Maybe a sign would have helped, maybe a flagger would have helped, but I guarantee no matter what precautions you would have implemented, guys like the dude in the black truck would have fucked something up anyway.