Lawmakers on Capitol Hill are pushing to keep AM radio in the nation’s cars. A bipartisan group in Congress has introduced the “AM for Every Vehicle Act.” It would require automakers to keep AM radio in new cars at no additional cost. Supporters cite public safety concerns and AM radio’s critical role in transmitting emergency alerts. The proposed legislation arrives as more and more automakers say goodbye to AM radio in newer car models. Critics of the bill say that mandating AM radio is unnecessary — pointing to the Integrated Public Alerts and Warning System, which can distribute safety warnings across AM, FM, internet-based and satellite radios, as well as over cellular networks.