A shapefile data set for roads in part of Concord, Massachusetts,
  USA comprising the following files:
 
     concord_roads.dbf
     concord_roads.shp
     concord_roads.shx
 
  Source
  ------
  Office of Geographic and Environmental Information (MassGIS),
  Commonwealth of Massachusetts  Executive Office of Environmental Affairs
  (http://www.state.ma.us/mgis/)
 
  Coordinate system/projection
  ----------------------------
  All data distributed by MassGIS are registered to the NAD83 datum,
  Massachusetts State Plane Mainland Zone coordinate system. Units are in
  meters.
 
  Data set construction
  ---------------------
  This data set was constructed by concatenating Massachusetts Highway
  Department road shapefiles for the Maynard and Concord USGS Quadrangles,
  from compressed files mrd97.exe and mrd104.exe.
 
  Features were selected with bounding boxes intersecting the following
  box:
            [206500 (min easting)  910500 (min northing)
             211500 (max easting)  913500 (max northing)]
 
  The following attributes were retained:
 
      'STREETNAME', 'RT_NUMBER', 'CLASS', 'ADMIN_TYPE', 'LENGTH'
 
  Attributes 'CLASS' and 'ADMIN_TYPE' contain numerical codes defined by
  MassGIS as follows:
 
  Road classes (from file mrdac.dbf)
  ----------------------------------
  CLASS 1 Limited access highway
  CLASS 2 Multi-lane highway, not limited access
  CLASS 3 Other numbered route
  CLASS 4 Major road - collector
  CLASS 5 Minor street or road
  CLASS 6 Minor street or road
  CLASS 7 Highway ramp
 
  Road admin types (from file mrdac.dbf)
  --------------------------------------
  ADMIN_TYPE 0 Local road
  ADMIN_TYPE 1 Interstate
  ADMIN_TYPE 2 U.S. Federal
  ADMIN_TYPE 3 State
 
  Construction date
  -----------------
  November 17, 2003.