I can attest to auto GPS fallacies in a more common scenario, giving a route that exists but is impassable.

Last October driving to a race in Northern California with friends we drove right past Death Valley and eventually over Route 4, to get to Big Bear. It goes over a high elevation winding pass and is essentially a lane and half wide and IIRC about 30 miles. It had already snowed and more was likely. Had we become stuck we'd have been screwed. Had they closed the gates at either end, we'd have been screwed.

Very much the Kim Family Scenario we discuss on here so often.

On road trips:
-Always have a paper state map/atlas. Do not rely on TomToms, Garmins and Smartphone apps.
-Always buy a local map when stop for gas.
-Always ask the attendant about any possible road issues ahead if you deviate from a main highway (closures, snow, slides, construction).