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United States Environmental Protection Agency
National Emissions Inventory Vehicle Miles Traveled, U.S., 2014, EPA/OAR/OAQPS/AQAD
This web service contains layers that depict gridded Vehicle Miles Traveled (VMT) for 2014 from the National Emission Inventory (NEI). The default 2014 National Emissions Inventory (NEI) vehicle miles traveled (VMT) data are developed primarily from information provided by the Federal Highway Administration (FHWA), along with the FHWA’s published Highway Statistics 2014, data from the Bureau of Census, and information provided by the US Environmental Protection Agency (EPA). This 2014 full VMT database was developed to provide default VMT at the county, road type, and vehicle type level of detail, to be used in the 2014 NEI in areas for which no state or local agency provided VMT data. The road types included were the 12 Highway Performance Monitoring System (HPMS) functional roadway types while the vehicle types used were the six MOVES HPMS vehicle types , for a total of 72 records per county. To be compatible with MOVES inputs and for easy import into the MOVES HPMSVtypeYear table, the data were also provided at the level of county and HPMSVtypeID. In both cases, the VMT data provided are annual data in units of millions of vehicle miles. The 2014 VMT database was developed using data supplied directly by FHWA and as well as publicly available data from the 2014 version of FHWA’s Highway Statistics data series (
). The FHWA data sets that were provided include a subset of fields from the 2014 HPMS database. The HPMS database is at the link level of detail. Each link is coded with the corresponding state, county, and, if applicable, urban area code. The roadway functional system code is included. The beginning point and ending point mileage of the link are included, from which the length of the link can be calculated. In addition, the total average annual daily traffic (AADT) volume is included along with AADT for single-unit trucks and combination trucks. Annual VMT can then be calculated by multiplying the link length by the AADT and multiplying by 365. 2014 annual county-level VMT data was spatially allocated to the 12US2 (12km Contintental US) grid using spatial surrogates corresponding to different road types. SMOKE was used first to apply the spatial surrogates to the VMT data.
This GIS dataset presents annual Vehicle Miles Traveled (VMT) for 2014 spatially allocated to 12 KM grid sqaures to help determine spatial distribution of traffic and mobile source air emissions.
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FGDC Content Standard for Digital Geospatial Metadata
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