I remember clearly the day that I was driving along the main street of a nearby suburb in an extreme heatwave. The traffic wasn't very heavy on the four lane road but it was consistent and moving fairly steadily. Suddenly a man walked straight off the footpath on a diagonal path across the road, totally oblivious of the traffic coming both ways. It was just sheer luck which stopped him from being run over by one or more cars.

He appeared to be in a world of his own, he was extremely red in the face, and looked like he was not in the best of health. I suspect that he had been out in the heat, not drunk enough water, and put himself in danger of a serious health crisis. He was heading towards a shady park so I hope that he found somewhere out of the heat but I lost sight of him, so I don't know if he was all right.

So drink lots of water, keep hydrated and keep safe.