You are quite redundant when using subjects, and theres a feeling of ausence because you dont symbology link the apparition of two green, irradiated infected (could have something to do with radiation, a nuclear plant near maybe). There could be more hard for them to reach a safe zone, using their heads to make strategy, probable a plan, to avoid as much populated areas as posible. The cars should have being more damaged by constant infected throwing themselves at them, maybe long arms sharp bones could have scrathed them, and they would need repairment on the base...I could follow, but then I should write it myself, while I didnt lie, I still enjoyed it and the final is ok. It works and I wasnt asking for much more, consider it an exercise for when you participate more directly on the quest, as protagonist.