README for “Alternative Fuel Corridors 2021-Present” dataset. U.S. Department of Transportation (DOT), Federal Highway Administration (FHWA); U.S. Department of Transportation (USDOT), Bureau of Transportation Statistics (BTS) [distributor] 2025-06-09 ---------------------------------------------------------------- LINKS TO DATASET ---------------------------------------------------------------- A. Dataset archive link: https://doi.org/10.21949/1404300 B. NTAD catalog dataset link (Current Year): https://doi.org/10.21949/1527991 ---------------------------------------------------------------- SUMMARY OF DATASET ---------------------------------------------------------------- The Alternative Fuel Corridors 2021-Present dataset is from the Federal Highway Administration (FHWA), and is part of the U.S. Department of Transportation (USDOT)/Bureau of Transportation Statistics’s (BTS's) National Transportation Atlas Database (NTAD). The dataset is a highway layer of corridors, primarily along the NHS, that are designated as Corridor Ready or Corridor Pending. It includes designations of five types of alternative fuels, Electric Vehicle Charging (EV), Compressed Natural Gas (CNG), Liquefied Natural Gas (LNG), Propane (LPG), and Hydrogen. Corridor-ready segments currently contain a sufficient number of fueling facilities to allow for corridor travel with the designated alternative fuel, and to qualify for highway signage. Corridors that do not have sufficient alternative fuel facilities to support alternative fuel vehicle travel are designated as corridor pending. ---------------------------------------------------------------- TABLE OF CONTENTS ---------------------------------------------------------------- A. General Information B. Sharing/Access & Policies Information C. Data and Related File Overview D. Methodological Information E. Data-Specific Information for: Alternative Fuel Corridors 2021-Present [datasets] F. Update Log ---------------------------------------------------------------- A. GENERAL INFORMATION ---------------------------------------------------------------- 0. Title of Dataset: Alternative Fuel Corridors 2021-Present [dataset] 1. Description of Dataset: The Alternative Fuel Corridors 2021-Present dataset is from the Federal Highway Administration (FHWA), and is part of the U.S. Department of Transportation (USDOT)/Bureau of Transportation Statistics’ (BTS's) National Transportation Atlas Database (NTAD). The dataset is a highway layer of corridors, primarily along the NHS, that are designated as Corridor Ready or Corridor Pending. It includes designations of five types of alternative fuels, Electric Vehicle Charging (EV), Compressed Natural Gas (CNG), Liquefied Natural Gas (LNG), Propane (LPG), and Hydrogen. Corridor-ready segments currently contain a sufficient number of fueling facilities to allow for corridor travel with the designated alternative fuel, and to qualify for highway signage. Corridors that do not have sufficient alternative fuel facilities to support alternative fuel vehicle travel are designated as corridor pending. 2. Dataset archive link: https://doi.org/10.21949/1404300 3. Authorship Information: Principal Data Creator or Data Manager Contact Information Institution: U.S. Department of Transportation (DOT), Federal Highway Administration (FHWA) Address: 1200 New Jersey Ave SE, Washington D.C. 20590 Contact: ExecSecretariat.FHWA@dot.gov Data Distributor Contact Information Name: National Transportation Atlas Database (NTAD) Institution: U.S. Department of Transportation (USDOT), Bureau of Transportation Statistics (BTS), Office of Spatial Analysis and Visualization (OSAV) Address: 1200 New Jersey Ave. SE, Washington D.C. 20590 Email: ntad@dot.gov 4. Date of data collection and update interval: This dataset is updated annually. This dataset is updated annually. Dataset Manager is contacted to verify changes to data resulting in NTAD update. The metadata is updated in the same manner. For the most recent data, please visit the NTAD catalog at https://doi.org/10.21949/1527991 5. Geographic location of data collection: United States of America 6. Information about funding sources that supported the collection of the data: Federal Highway Administration (FHWA), U.S. Department of Transportation (DOT) ---------------------------------------------------------------- B. SHARING/ACCESS & POLICIES INFORMATION ---------------------------------------------------------------- 0. Recommended citation for the data: U.S. Department of Transportation (DOT), Federal Highway Administration (FHWA), U.S. Department of Transportation, Bureau of Transportation Statistics (BTS) [distributor]. Alternative Fuel Corridors 2021-Present [datasets]. 1. Licenses/restrictions placed on the data: These data are in the Public Domain. 2. Was data derived from another source?: Yes. Corridor designations are received from the States each year and evaluated. 3. This document was created to meet the requirements enumerated in the U.S. Department of Transportation's 'Plan to Increase Public Access to the Results of Federally-Funded Scientific Research' Version 1.1 << https://doi.org/10.21949/1520559 >> and guidelines suggested by the DOT Public Access website << https://doi.org/10.21949/1503647 >>, in effect and current as of December 03, 2020. ---------------------------------------------------------------- C. DATA & RELATED FILE OVERVIEW ---------------------------------------------------------------- 1. File List for the Alternative Fuel Corridors 2021-Present dataset A. Filename: bts_NTAD_Alternative_Fuel_Corridors_DMP_20250609.pdf Short description: A PDF file containing the Data Management Plan that was created for current and future management of the data and associated files. B. Filename: bts_NTAD_Alternative_Fuel_Corridors_README_20250609.txt Short description: The README.txt file that includes human-readable information about the data, variable definitions, contact information, and other contextual information. The file you are reading now. C. File List for the Alternative_Fuel_Corridors_NTAD2021_Present.zip collection. Ca. File List for NTADXXXX_GDB_Final_Alternative_Fuel_Corridors_XXXX_XX_XX.zip collection Ca 1. Filename: NTADXXXX_GDB_Final_Alternative_Fuel_Corridors_XXXX_XX_XX.gdb.zip (Folder) Short description: Compressed file folders containing the geospatial data for Alternative Fuel Corridors 2021-Present dataset. File folders are classified by NTAD publication year and data vintage date respectively. Geodatabase (GDB) folders contain all the necessary components to view and otherwise interact with their data. Ca 2. Filename: Alternative_Fuel_Corridors.xml Short description: Extensible Markup Language (XML) files containing key metadata and documentation information such as methodology, procedures, etc. Ca 3. Filename: AltFuel Corridors.xlsx or Alternative_Fuel_Corridors.xlsx Short description: Excel spreadsheet containing the dataset's data dictionary including attribute field names and definitions for fields and applicable values. ---------------------------------------------------------------- D. METHODOLOGICAL INFORMATION ---------------------------------------------------------------- 1. Description of methods used for collection/generation of data: Proposed Ready and Pending Corridor designations are received from the States each year and evaluated. The Alternative Fuel Corridors shapefile is updated each year with the new FHWA confirmed designations using ArcGIS. 2. Instrument- or software-specific information needed to interpret the data: File geodatabase data can only be opened with Esri ArcGIS. The documentation files can be opened with any basic text editor. ---------------------------------------------------------------- E. DATA-SPECIFIC INFORMATION ---------------------------------------------------------------- 1. Alternative Fuel Corridors data table Due to the size of the data, it is not described in detail here. Review the data dictionary present in the data folders for information on the data table. A. Number of variables (columns): The data dictionary found in Alternative_Fuel_Corridors.txt or Alternative_Fuel_Corridors.xlsx provides definitions for the variables B. Data Dictionary/Variable List: Because of the large number of variables, please refer to the Data Dictionary found within the file Alternative_Fuel_Corridors.txt or Alternative_Fuel_Corridors.xlsx for names, definitions, and formats of variables. C. Missing data codes: None ---------------------------------------------------------------- F. UPDATE LOG ---------------------------------------------------------------- This bts_Alternative_Fuel_Corridors_20250609_README.txt file was originally created on 2025-05-28 by Dominic Menegus, Geographer, dominic.menegus@dot.gov [Note changes or update to the readme.txt file, e.g.:] 2025-06-09: Original file created 2025-10-27: DOI added