962 resultados para Railroad grade crossings.
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Transportation Systems Center, Cambridge, Mass.
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Summaries of the data gathered for this project.
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Mode of access: Internet.
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Federal Railroad Administration, Office of Safety, Washington, D.C.
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Texas Department of Transportation, Austin
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Federal Railroad Administration, Office of Policy and Program Development, Washington, D.C.
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Mode of access: Internet.
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Federal Railroad Administration, Office of Policy and Program Development, Washington, D.C.
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Transportation Systems Center, Cambridge, Mass.
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Federal Railroad Administration, Office of Research and Development, Washington, D.C.
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Federal Highway Administration, Office of Research, Washington, D.C.
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Federal Highway Administration, Office of Research and Development, Washington, D.C.
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Federal Highway Administration, Office of Research, Washington, D.C.
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Transportation Systems Center, Cambridge, Mass.
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Federal Highway Administration, Offices of Research and Development, Washington, D.C.