Hazardous materials transportation : joint hearing before the Subcommittee on Telecommunications, Consumer Protection, and Finance and the Subcommittee on Commerce, Transportation, and Tourism of the Committee on Energy and Commerce and the Subcommittee on Government Activities and Transportation of the Committee on Government Operations, House of Representatives, Ninety-ninth Congress, second session on H.R. 4612, a bill to amend Title 49, United States Code, to centralize motor carrier safety responsibilities within the National Highway Traffic Safety Administration, to improve hazardous materials transportation enforcement, and for other purposes, July 16, 1986.