Humans are idiots, and the whole point is to keep them alive anyway. They can’t claim they didn’t hear a blast from the train horn.

A few years back they were trying to improve train safety after idiots in Florida kept ignoring the gates and getting run over, so they started using horns again in my town

But the interesting part was the compromise. They decided a better safety option was to build medians at every grade crossing, so idiots can’t drive around the gates. No more horns again permanent infrastructure, nothing active or clever needed