Zombie Apocalypse

The highway is desolate and silent. No cars could be seen from each end. What happened? There are cars on this highway all the time. You need to find help and fast, Dave's time is running out every second. You fall. It wasn't you though. It was Dave. Dave tackles you to the ground and lunges at your neck. You dodge barely and start to run towards the truck. Dave limps toward you, lifeless and groaning. He looked exactly like a zombie, was he a zombie? Suddenly, you spot the key in Dave's pocket. Glinting in the broad daylight, the only weapon around. It's your only shot.