bill_id,subject
112-s-2011,Air quality
112-s-2011,Federal preemption
112-s-2011,Intergovernmental relations
112-s-2011,Motor carriers
112-s-2011,"Navigation, waterways, harbors"
112-s-2011,Roads and highways
112-s-2011,State and local government operations
112-s-2011,Transportation costs
112-s-2011,Transportation safety and security