About the zombies, I think the main issue would be that it would take forever for the authorities to order the police and army to shoot the zombies. They would treat the zombies as sick people and tell the police to try to restrain them and take them to the hospital, use riot gear and equipment to control zombie mobs and arrest people who did kill zombies. Policemen would soon get zombified or leave town, and soldiers would get the same problem later... Zombies would be everywhere before real measures were taken...

And yes, many, maybe most zombies would get their bones broken by cars trying to run away...