Here in Oregon, we have this happen once every couple of years. Backroads here are treacherous, and people don't understand how dangerous it is.
Prayers to the family.
Scott
Same up here in Washington. Even experienced hikers over do it and get lost. Recently we've been lucky and found a couple before it was too late.
Here in SoCal during the summer months, I carry extra water in my car just driving the freeways between work and home. Stuck on the freeway in the heat makes me very glad I carry extra water. Temps at 105 sitting in a car even with a/c thirst can come quickly. My mother taught me never to let the fuel level get below half, especially when traveling in unfamiliar areas or in bad weather. When I lived in Mass. we would put a tin can, candle, matches, extra blankets, food/water and extra clothing in the back of the car for winter supplies. Just standard procedure.