No one knew where they come from, but one thing is sure, you would not want to encounter them anywhere since they are going to feat on your flesh. Imagine, you would bee eaten even if you are alive. What is worst is that you would transform into one of them since the saliva of those undead has a disease that can turn the living into an undead monster. You would hope that you would die that instant since it is too painful, but you would lucky if you would die in an instant since that is not going to happen as you would bee turned into one of them. The streets are filled with them, anywhere you go you would surely encounter them and what are you going to do to get out of there. If you have a vehicle than your best option would be to get out of there. You need to get to a safe place, where there are less zombies. Those zombies would surely beat up the vehicles passing through them. It would be wise to avoid any collision with them, but since there are too many of them on the road, which would be impossible. In this game, you need to get out of that place an into a safe haven, but that would be along run. Your course of action right now is to avoid colliding with any of those zombies and be able to get as far as you can. You can pick up some fuel, repair kit, money on the road and it would be useful in the long run. But, for now, you should concentrate on your driving skills. You can upgrade your truck once you are out of gas. The money that you pick on the road would be useful in upgrading your truck.