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.
For individuals in the United States driving outside their own state, having a motor club membership card can be helpful when dealing with law enforcement.  Many other states don't recognize out-of-state driver's licenses for posting bail, but they often accept motor club member cards as proof of identity and standing.