Autopilot is not a standard mid range car feature.

"Enhanced Autopilot adds these new capabilities to the Tesla Autopilot driving experience. Your Tesla will match speed to traffic conditions, keep within a lane, automatically change lanes without requiring driver input, transition from one freeway to another, exit the freeway when your destination is near, self-park when near a parking spot and be summoned to and from your garage."

You can get adaptive cruse control for more reasonable costs, but lane changing takes a lot more awareness around the car.