About the only piece of modern technology I can think of that will still work reliably is the guns.
Draw your own conclusions.
You cannot take the human factor out of any of this, especially the American human.
I guarantee that if the cars stop because of tec problems their will be a work around very quickly
I'll go as far to say that in the event of a Armageddon that the American people WILL survive, no body on the face of the earth has more resolve than the American people period.
BigMack