Apologies, my OP should have been more specific.however I interpreted the OPs post as to evacuation concerns due to other than non - natural circumstances.
You are correct, I was thinking of non-natural circumstances being the trigger for the evacuation, or a confluence of both natural and non-natural events. For example, breakdown of social order (for whatever reason) would likely compromise utilities, sanitation, power, and food supplies. If you live in a densely populated urban environment, staying in your home with no food, running water, power, or sanitation might be a greater concern than hitting the road and seeking refuge elsewhere. Alternatively, even if you're out in the boonies during the breakdown of social order, a wildfire would probably prompt you to risk running for the hills. Or if in this hypothetical breakdown of social order scenario gangs and factions begin going door-to-door heavily armed and in large numbers (30+) looking for food, water, guns, ammo, and other resources, you might determine it's safer to head out than outshoot an overwhelming force. The specific criteria will vary from one person to the next, which is why the first question is:
What circumstances would drive you to pack up and leave your home in this kind of situation?