Hazardous Material Routes - Data Dictionary

Abstract: The Federal Motor Carrier Safety Administration (FMCSA) Hazardous Material Routes were developed using the 2004 First Edition TIGER/Line files. The routes are described in the National Hazardous Material Route Registry (NMHRR). The on-line NMHRR linkage is http://hazmat.fmcsa.dot.gov/nhmrr/index.asp
With the exception of 13 features that were not identified with the TIGER/Line, Hazardous Materials (HAZMAT) routes were created by extracting the TIGER/Line segments that corresponded to each individual route. HAZMAT routes in the NTAD, are organized into 3 database files, hazmat.shp, hmroutes.dbf, and hmstcnty.dbf. Each record in each database represents a unique TIGER/Line segment. These TIGER/Line segments are grouped into routes identified as character strings in the ROUTE_ID field in the hmroutes.dbf table. The route name appearing in the ROUTE_ID is assigned by FMCSA and is unique for each State [this sentence could be deleted - it doesn't add a lot to it]. The hmstcnty.dbf table allows the user to select routes by State and County. A single shapefile, called hazmat.shp, represents geometry for all routes in the United States.

Purpose: In order for the public to be able to view the HAZMAT Routes reported to FMCSA, the data is being released in ESRI shapefile format for use in a GIS.
Supplemental_Information: The data provided is in the native Latitude/Longitude coordinate system inherited from the TIGER/Line data.