People die regularly in the "outback" in Australia during the summer months from having their car break down in 40 plus temperatures (often over 50). Their deaths are always caused from leaving their car and trying to walk to safety - disastrous decision - in those temperatures when walking in the full exposure of the sun they can lose their ability to make rational decisions in as little as 2 hours, and be dead in 8. The cardinal rule is ALWAYS stay with your vehicle, conserve energy, and keep out of the sun. When this procedure is followed rescue has always occurred, sometimes it may take days but by the conservation of energy survival is the norm, walking is a certainty - death -.