A shapefile data set for roads in part of Boston, Massachusetts,
  USA comprising the following files:
 
     boston_roads.dbf
     boston_roads.shp
     boston_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 reading the Massachusetts Highway
  Department road shapefile from compressed file mrd126.exe. 
 
  Features were selected with bounding boxes intersecting the following
  box:

       [232964.93 (min easting) 899505.66 (min northing)
        237444.93 (max easting) 902385.66 (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 15, 2003.