a person averages 2.5 miles per hour walking on flat terrain. be home in 32 hours, all things considered.

is the river bridge intact?

are there other bridges ahead of you that may also be down?

probably unknown.

in this scenario i'd go with the known - walking - as i feel giving your car to a stranger is fraught many issues. all you need is some law enforcement official to ask to see your insurance and registration. "well, we swapped cars, officer."

depends on how soon you need / want to be home.

for me, i looked closely at this issue several years ago and rerouted my way home, knowing full well that here in so cal the bridges will fall in THE BIG ONE and everyone else will be on the blocked roads too.

a bicycle is stored at work for the hope-it-never-happens ride home. i won't even consider driving. too many bridges and a couple of semi-wet, but crossable if needed, rivers between me and home.

great mind challenge!