342 resultados para Highway communications
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Federal Highway Administration, Washington, D.C.
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Mode of access: Internet.
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Mode of access: Internet.
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Federal Highway Administration, Office of Safety and Traffic Operations, Washington, D.C.
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National Highway Traffic Safety Administration, Washington, D.C.
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National Highway Traffic Safety Administration, Washington, D.C.
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National Highway Traffic Safety Administration, Washington, D.C.
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National Highway Traffic Safety Administration, Washington, D.C.
The development of an improved railroad-highway grade crossing risk factor. Executive summry report.
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Ohio Department of Transportation, Columbus
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Ohio Department of Transportation, Columbus
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Federal Highway Administration, Office of Research and Development, Washington, D.C.
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Transportation Department, Office of University Research, Washington, D.C.
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Transportation Department, Office of University Research, Washington, D.C.
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Transportation Department, Office of University Research, Washington, D.C.
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Texas State Department of Highways and Public Transportation, Transportation Planning Division, Austin