For varying reasons, more than 12 million cars with its air bags have been recalled worldwide.Honda has been hit hardest in the latest round of recalls with about 5 million cars called back. Other affected automakers include Nissan, Chrysler, Ford, Mazda, Subaru, Mitsubishi, Toyota, BMW and General Motors. Lawmakers say that 30 million cars with potentially faulty Takata air bags are driving on U.S. roads.In the letter, NHTSA Deputy Administrator David Friedman told Takata that its inflators are "creating an unacceptable risk of deaths and injuries by projecting metal fragments into vehicle occupants rather than properly inflating the attached air bag."The letters sent to automakers urge them to speed up owner notification and replacement part distribution.