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Direct Download of National Transportation Atlas Database (NTAD) Geospatial Files

Wednesday, November 17, 2021

The National Network (NN)

The National Network (NN) dataset is as of December 22, 2020 and is from the Federal Highway Administration (FHWA) along with the Bureau of Transportation Statistics (BTS) as part of the U.S. Department of Transportation (USDOT)/Bureau of Transportation Statistics’ (BTS') National Transportation Atlas Database (NTAD). The NN was authorized by the Surface Transportation Assistance Act of 1982 (P.L. 97-424) and specified in the U.S. Code of Federal Regulations (23 CFR 658) to require states to allow conventional combinations on the Interstate System and those portions of the Federal-aid Primary System serving to link principal cities and densely developed portions of the states on high volume routes used for interstate commerce extensively by large vehicles that do not have any unusual characteristics causing current or anticipated safety problems. The NN includes almost all of the Interstate Highway System and other, specified, non-Interstate highways. The network comprises more than 200,000 miles of highways. The NN supports interstate commerce by regulating the size of trucks. This file is a geospatial representation of the National Network as described in 23 CFR 658 Appendix A and should not be interpreted as the official National Network and should not be used for truck size and weight enforcement purposes or for navigation.
NN Download Link

The Highway Performance Monitoring System (HPMS)

The Highway Performance Monitoring System (HPMS) Layer is provided by the Federal Highway Administration (FHWA), and provides data that reflects the extent, use, condition, and performance of the public roads in the United States. It consists of the All Road Network of Linear Referenced Data (ARNOLD) and Section Data which is the attribution. ARNOLD and Sections are linked though linear referencing. This data is analytical for the purpose of supporting transportation program, funding and policy decisions at a national level. Operational applications such as navigation and routing may take advantage of HPMS with the understanding that it represents the average and not “real-time” of the system. The HPMS data privided through the link below is a zipped ESRI Geodatabase, containing one feature class for all of HPMS.
HPMS Download Link

All Roads Network Of Linear Referenced Data (ARNOLD)

The All Roads Network Of Linear Referenced Data (ARNOLD) Layer is provided by the Federal Highway Administration (FHWA), and derives and is collected from State DOT road data. ARNOLD consists of locations of all roads in the U.S., and has limited attribute data. ARNOLD can be used by the public to create linear reference models. The ARNOLD data privided through the link below is a zipped ESRI Geodatabase, containing 51 feature classes, with each feature class being a state's ARNOLD submission to FHWA, including DC.
ARNOLD Download Link

National Transit Map Data

The National Transit Map (NTM) is a nationwide catalog of fixed-guideway and fixed-route transit service in America that is gleaned from publicly available information. A geospatial database is included that can be used to display transit agencies’ stops, routes, and schedules for the purpose of supporting research, analysis, and planning. The national, openly available map of fixed-guideway and fixed-route transit service in America will allow the U.S. Department of Transportation (DOT) to demonstrate the importance and role of transit in American society and to identify and address gaps in access to public transportation. It will also support research, planning and analysis on the benefits of transit, such as the economic impacts of transit on a community’s economic development, or on reducing poverty in low-income neighborhoods. The intent of the National Transit Map is to support research, analysis, and planning. It is not intended to replace existing customer services available through transit agency websites and commercial trip planning service providers. These data fall under the creative commons-BY (CC-BY) license [creativecommons.org], whereas those using these data need to credit the data providers. For more information please see the National Transit Map.
NTM Data Download Link

For additional geospatial information and datasets on NTAD, please see the NTAD Open Data Catalog.