If you miss your exit on the highway, you should:

If you miss an exit, continue to the next exit, get off there, and turn around. Backing up on a highway shoulder is extremely dangerous and illegal in every state — vehicles behind you cannot see your reverse maneuver in time to react. Crossing the median is also illegal and dangerous on a divided highway. The additional time spent driving to the next exit is the inconvenience cost of a missed exit; the alternative costs far more. Plan your route in advance so you know which exit you need, and pay attention to mile-marker signs that often warn of approaching exits. GPS systems can also recover quickly from a missed exit by routing you to the next available turnaround.