Take my parents off-road capable vehicle with tinted windows and a bullbar and go somewhere where there's no zombies.
Tint stops the glass from braking as easily, and the bullbar and torques can push cars/zombies/other people out of the way fairly easily.
Regroup with the millions of people that survived (protip: zombies can't get into cars easily. Ever tried to punch through a cars side window? You break long before the glass does.) and then we have the choice of either going back to the cities with flamethrowers, or just getting a bunch of trained dogs and telling them to go nuts.
Tint stops the glass from braking as easily, and the bullbar and torques can push cars/zombies/other people out of the way fairly easily.
Regroup with the millions of people that survived (protip: zombies can't get into cars easily. Ever tried to punch through a cars side window? You break long before the glass does.) and then we have the choice of either going back to the cities with flamethrowers, or just getting a bunch of trained dogs and telling them to go nuts.