Modern car odometers can typically record up to a maximum mileage, often up to one million miles depending on the design. When a car drives beyond this maximum reading, the odometer resets to zero and starts counting again from there. This behavior is similar to an odometer "rolling over" or "overflowing" because it cannot display numbers beyond its digit limit

. For example, a mechanical or digital odometer with 5 digits can show up to 99,999 miles or kilometers, and after reaching this limit, it will roll over to 00,000 and continue counting. This means the displayed mileage is no longer accurate for the total distance traveled once the odometer has rolled over

. This rollover does not affect the car's mechanical operation; it is simply a limitation of the odometer display. The actual wear and tear on the vehicle depend on the true mileage and maintenance history, not just the number shown on the odometer

. In summary:

• Modern odometers have a maximum mileage they can display (often up to a million miles).
• Upon exceeding this limit, the odometer reading resets to zero and starts over.
• This rollover means the odometer reading no longer accurately reflects the total miles driven beyond that point