I think about this just about every time I leave the house, especially if the distance is greater then 20 miles or more. I maintain maps of the area, my EDC bag, and spare water and food sleeping bag and tarp in the vehicle i'm driving. It get's more complicated as I take a friend to dialysis every other day or so which is about 20 miles away. If/when disaster strikes EMP or CME ,and we are on foot/wheel chair, there is a lot of challenges along the way. There likely won't be any GPS or cell phone service. The harsh reality, without dialysis my friend will not survive long. Pushing 250+ Lbs of person and gear will deteriorate a wheel chair on highway rather fast, (providing the highway is passable), not to mention my own ability to continuously push the chair . Weather can also have adverse effects on travel. Often times there are more than one specific disaster happening at the same time. Earth quake can include flood and fire, as well as desperate people panicking over the events. I've been forced on foot before ,but there were no conditions such as the afore mentioned , and the walk was not any special event. Dad stuck his truck in the woods, so we hiked out. By the way , If I ride with some one else, My EDC bag always comes along, and I'm watching the terrain ,considering the potential walk home. What are the obligations and added loads to your capacity in the realm of getting home on foot ?