In the same vein, the average car on US roads is 12 years old. So the average driver is dealing with the safety considerations of a vehicle that isn't a perfect

In the same vein, the average car on US roads is 12 years old. So the average driver is dealing with the safety considerations of a vehicle that isn't a perfectly maintained current model. Maybe making the point of comparison with professional drivers in fleet cars would be more accurate, but I doubt that data is available.