In the USA this is especially useful for members driving outside their own state, since other state law enforcement agencies commonly do not recognize posting out-of-state driver's licenses as bail bond, but often will accept motor club member cards.
In the USA, this is particularly beneficial for drivers traveling outside their home state when dealing with law enforcement.  Many other states do not recognize out-of-state driver's licenses for posting bail, but they often accept motor club member cards as proof of identity and standing.