Opinions, findings or conclusions expressed herein are those of the authors and do not necessarily reflect the views of TRB or the National Academies
William W. Hay Railroad Engineering Library
Transportation Research Board (TRB)
Federal Railroad Administration (FRA)
FRA Research and Development
Volpe National Transportation Systems Center
Operation Lifesaver, Inc.
Association of American Railroads (AAR)
Federal Highway Administration (FHWA)
National Transportation Safety Board (NTSB)
American Railway Engineering and Maintenance-of-Way Association (AREMA)
National Committee of Uniform Traffic Control Devices