Nothing is known of the mile marker's history before the outbreak.
Sarah unloads supplies from the back of the truck and cuts Jim's bonds after he negotiates a deal. Sarah orders them back in the truck when a herd appears. Jim accidentally knocks Morgan into the herd's path. Morgan jumps on top of a car. The herd immediately swarm him. Sarah offers to help if he discloses the location of his community. Once he gives her the directions, however, she abandons him. She also reveals that she knows the bridge was not out.
Morgan remains on top of the car into the night. He radios Sarah and implores her to return so that he can help his friends in Texas. He gets no response. He leaps over the heads of the walkers, grabs a knife from a supply box and cuts himself free. He kills the walkers with the knife and a mile-marker pole.
- "The Code"