There is a trophy for maxing one of your driver's career bar, which is different from maxing his level at 40. Even though the trophy is called Air of Experience, there was apparently a translation difference and in English it is the career bar, and not the experience bar.
Also I noticed that if you have a driver shared for the remote race thingy, they won't be able to take part in any non-online races until they are unshared. They also won't gain career bar points
XI Wiki





