TRR meaning in Governmental ?

The Transportation Research Board (TRB) is a division of the National Academy of Sciences, Engineering, and Medicine, formerly the National Research Council of the United States, which serves as an independent adviser to the President of the United States, the Congress and federal agencies on scientific and technical questions of national importance. It is jointly administered by the National Academy of Sciences, the National Academy of Engineering, and the National Academy of Medicine.

As one of seven major divisions of the National Academies of Sciences, Engineering, and Medicine, TRB promotes innovation and progress in transportation through research in an objective and interdisciplinary setting. It stimulates research and offers research management services that promote technical excellence; provides expert advice on transportation policy and programs; and disseminates research results broadly and encourages their implementation. TRB hosts some 200 standing committees that address specific aspects of transport and the TRB Annual Meeting attracts more than 14,000 attendees.