Driveways obviously should be designed to hold more than a patio.
There are certain types of stones that are recommended for vehicular traffic. The length of the stone should not be more than 3 times its thickness.
A 12-inch wide stone, then, would need to be 4 inches thick. Unfortunately, there are no stones that are 4 inches thick. This rule is often violated and it negates the manufacturer’s warranty.
Customer may elect to use a larger stone, but they need to know the liability in doing so.