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He took part in the 1955 Road Test in Ottawa, Illinois, where the basic designs for Interstate pavements were developed. Mertz was assigned in 1956 to the Bureau of Standards to develop standards for computer software for use in highway engineering applications. During the 1960s he worked with such groups as the National Capital Transit Agency in Washington, D.C. and the Tri-State Transportation Commission in New York. He also served as an administrator in the planning of the Interstate Highway System, including the Washington Beltway, I-95 in Maryland, and the Washington Metrorail System. In 1969 Mertz returned to the Federal Highway Administration as Chief of the Urban Planning Division and developed transportation planning studies in all 213 metropolitan areas of the nation. After he left the Federal Highway Administration, Mertz took it upon himself to assemble documents and materials that were important in the development of the Interstate system, and, more generally, to the development of highways and urban transportation policy. Mertz died in 1993."],"prefercite_html_tesm":["\u003cp\u003eWilliam L. Mertz transportation collection, C0050, Special Collections Research Center, George Mason University Libraries.\u003c/p\u003e  "],"prefercite_tesim":["William L. Mertz transportation collection, C0050, Special Collections Research Center, George Mason University Libraries."],"processinfo_html_tesm":["\u003cp\u003eProcessed and finding aid compiled by Robert Vay, Vikram David, Estee L. Dudash, Barbara Haase, and Kaycee Morgan in 1995. EAD markup completed in February 2009 by Eron Ackerman and Jordan Patty.\u003c/p\u003e  "],"processinfo_heading_ssm":["Processing Information"],"processinfo_tesim":["Processed and finding aid compiled by Robert Vay, Vikram David, Estee L. Dudash, Barbara Haase, and Kaycee Morgan in 1995. EAD markup completed in February 2009 by Eron Ackerman and Jordan Patty."],"relatedmaterial_html_tesm":["\u003cp\u003eThe Special Collections Research Center also holds other \u003cextptr show=\"new\" title=\"transportation-related collections\" href=\"https://aspace.gmu.edu/subjects/sh85137027\"\u003e\u003c/extptr\u003e\u003c/p\u003e  "],"relatedmaterial_heading_ssm":["Related Material"],"relatedmaterial_tesim":["The Special Collections Research Center also holds other"],"scopecontent_html_tesm":["\u003cp\u003eThe collection contains transportation related materials collected over a 45 year period. Types of materials include scholarly journal articles dealing with transportation topics, summaries of congressional acts relating to transportation, official reports and studies of transportation agencies, summaries of speeches given by transportation officials, and personal correspondence among transportation officials. Many of these documents are photocopies of the original materials. The material covers a wide variety of topics, such as The Federal Highway Acts, bridges, buses, the environment, transportation in cities, commuting, and trucking. Organizations represented by materials in the collection include the Federal Highway Administration,the Department of Transportation, the Tri-State Transportation Commission, and the American Association of State Highway and Transportation Officials.\u003c/p\u003e  "],"scopecontent_heading_ssm":["Scope and Content"],"scopecontent_tesim":["The collection contains transportation related materials collected over a 45 year period. Types of materials include scholarly journal articles dealing with transportation topics, summaries of congressional acts relating to transportation, official reports and studies of transportation agencies, summaries of speeches given by transportation officials, and personal correspondence among transportation officials. Many of these documents are photocopies of the original materials. The material covers a wide variety of topics, such as The Federal Highway Acts, bridges, buses, the environment, transportation in cities, commuting, and trucking. Organizations represented by materials in the collection include the Federal Highway Administration,the Department of Transportation, the Tri-State Transportation Commission, and the American Association of State Highway and Transportation Officials."],"userestrict_html_tesm":["\u003cp\u003eThe copyright and related rights status of this collection have not been evaluated (See http://rightsstatements.org/vocab/CNE/1.0/)\u003c/p\u003e  "],"userestrict_heading_ssm":["Use Restrictions"],"userestrict_tesim":["The copyright and related rights status of this collection have not been evaluated (See http://rightsstatements.org/vocab/CNE/1.0/)"],"abstract_html_tesm":["\u003cabstract id=\"aspace_f4d093c79d30c6b0d8fa41e4235fa70e\" label=\"Abstract\"\u003eThe collection contains transportation related materials collected over a 45-year period. Types of materials include scholarly journal articles dealing with transportation topics, summaries of congressional acts relating to transportation, official reports and studies of transportation agencies, summaries of speeches given by transportation officials, and personal correspondence among transportation officials.\u003c/abstract\u003e\n    "],"abstract_tesim":["The collection contains transportation related materials collected over a 45-year period. Types of materials include scholarly journal articles dealing with transportation topics, summaries of congressional acts relating to transportation, official reports and studies of transportation agencies, summaries of speeches given by transportation officials, and personal correspondence among transportation officials."],"physloc_html_tesm":["\u003cphysloc id=\"aspace_06a248fa9f289c50a6873eeee011d316\"\u003eR22 C2 S7 - C4, S2-S7\u003c/physloc\u003e\n    "],"physloc_tesim":["R22 C2 S7 - C4, S2-S7"],"corpname_ssim":["George Mason University. Libraries. Special Collections Research Center","American Association of State Highway and Transportation Officials","Tri-State Transportation Commission","United States. Department of Transportation","United States. Federal Highway Administration"],"names_coll_ssim":["American Association of State Highway and Transportation Officials","Tri-State Transportation Commission","United States. Department of Transportation","United States. 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