In most parts of the world, the only safe way to travel is with a band of armed guards. The large spaces between enclaves are rife with gangs. Not everyone can afford the kind of protection needed to cross the wastes alone, so most people don't travel at all. Those few who do travel, usually sign on as caravan guards for the various convoys that ply the lanes between the remaining cities. The lucky ones sign on with ATV convoys, the unlcuky ones get stuck following the raider infested roads.