What limitation is imposed on the added M restriction to a driver's license?

The added "M" restriction on a driver's license, which designates the holder as licensed to operate a motorcycle, is tied to the validity of the driver's license itself. When the main driver's license expires, so does any associated restrictions or endorsements, including the "M" restriction. This means that if you do not renew your driver's license before it expires, you will also lose the privilege to operate a motorcycle until you have successfully renewed the entire license. Therefore, the limitation is specifically related to the expiration of the driver's license, making it essential for motorcyclists to keep their full license current in order to maintain their motorcycle operating privileges. This connection emphasizes the importance of regular renewal and staying compliant with licensing requirements for safe driving.