You stole a van, and headed to the highway thinking that you will be safe there. You were wrong. Highway is literary infested with zombies, but you have the van that could be somehow useful. Run over them, and make their bodies squish on the ground. Oh damn, you are running low on gas. Look for any possibility to fill the gas, so you can keep driving. Do not crash your van too much. Otherwise, zombies will eat you alive. Have fun.