https://vocabularyserver.com/trt/ Transportation Research Thesaurus (TRT) US National Academy of Sciences. Transportation Research Board Transportation Research, l modes and aspects of transportation US National Academy of Sciences. Transportation Research Board 1999-05-23 en 2009-03-18 19:24:25 65 mph speed limit 2009-03-18 19:24:25https://vocabularyserver.com/trt/xml.php?skosTema=1199