Lived in Arizona for a decade. Can confirm people are really fucking dumb with hiking in the heat. They close the trails around Phoenix every summer now and people go right past those signs and die anyways.

Arizona also has the dumb motorist law where if you need to be rescued from a flash flood you drove into, you're paying for it. In general Arizona is one of those states where signs saying "this is dangerous, turn around" should really be heeded.

The last one is the I-17 going up to Flagstaff. They have signs for when chains are required and areas to put them on. So when you're a hundred miles south of that point and the big electronic sign says "Chains or Turn Around"... Well you know where I'm going with that. There are sheer drops off the mountainside.