How would you defend against zombie outbreak? There are 10 all over city. Now people start infected. They are curious, so not defend hard against zombie? Like they see them as people, so get bit? Who even has seen one? Anyways, they worsen and infect many. Many get sick and turn to zombies. Now there are about 50 all over. Anyone who goes near would get swarmed.
You have a bike. A mountain bike because the terrain can be rough. Cars make too much noise and will run out of fuel. Motorcycles same, run out of fuel and loud. Will attract zombies.
What weapons? you need? Supplies? Food?