June 2014

(Formerly Mass. Highway Dept. (MHD) Roads and Executive Office of Transportation (EOT) Roads)


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Overview

This layer is the official state-maintained street transportation dataset available from MassGIS and represents all the public and a good portion of the private roadways in Massachusetts, including designations for Interstate, U.S. and State highways.

Formerly known as the Massachusetts Highway Department (MHD) Roads, then the Executive Office of Transportation - Office of Transportation Planning (EOT-OTP) Roads, the MassDOT roads layer includes linework from the 1:5,000 road and rail centerlines data that were interpreted as part of the Black and White Digital Orthophoto project. The Massachusetts Department of Transportation - Office of Transportation Planning, which maintains this layer, continues to add linework from municipal and other sources and update existing linework using the most recent color orthophoto imagery as a base. In addition to the new linework, the attribute table includes all "road inventory" fields maintained in MassDOT's linear referencing system. See the Attributes section below for more details.

The following feature classes are available:
 - EOTROADS_ARC (aka "All Roads") is the full statewide layer. Created from this layer are two subsets that may be useful in smaller-scale mapping:
 - EOTMAJROADS_ARC comprises major roads (CLASS = 1 through 4).
 - EOTMAJROADS_RTE_MAJOR is a multi-part line feature class consisting of all Interstate and U.S. routes and several major State routes.

The layer is up-to-date through December 31, 2013. The data were released by MassGIS on June 13, 2014.

Note: The "EOT" in the layer names was not changed to "DOT" because legacy application code and web services rely on the existing names.

Production

MassGIS received the 2013 year-end release of MassDOT's Road Inventory data and further processed the data to facilitate display, particularly in OLIVER (which includes the statewide Base Map ) and the MassGIS Data Viewer. Processing included:

  • adding the CLASS, ADMIN_TYPE and RDTYPE fields, used for line and route marker (shields) symbolization
  • adding the ALTRTNUM<1-4> and ALTRT1TYPE fields for enhanced route marker labeling
  • adding the RT_NUMBER and STREET_NAME fields so that existing applications that use these fields would continue to function

To produce the Major Roads layer (EOTMAJROADS_ARC), MassGIS selected arcs where CLASS = 1, 2, 3 and 4 from the full layer, dropped all fields included in the original layer from MassDOT, and dissolved on all the fields added by MassGIS to reduce the number of arc segments.

The Major Routes layer (EOTMAJROADS_RTE_MAJOR) was produced by MassGIS from the Major Roads layer by selecting all features where ADMIN_TYPE = 1 (Interstate) or 2 (U.S.), or where the RT_NUMBER or any of the alternate route numbers for state routes (ADMIN_TYPE = 3) is 2, 3, 8, 9, 18, 24, 25, 28 or 128. In ArcGIS 10.0, these roads were dissolved as multi-part features on the ADMIN_TYPE and RT_NUMBER fields. This layer was produced for fast display at small (e.g. statewide) scales rather than for true route-based analysis.

Attributes

Fields from MassGIS
Each arc in the "All Roads" EOTROADS_ARC feature class contains the following fields added by MassGIS: 
Field Name Type Description
CLASS 1-I 

Designates a road based on functional classification and access; used for plotting. Classes are:
 1 - Limited Access Highway
 2 - Multi-lane Highway, not limited access
 3 - Other numbered route
 4 - Major road - arterials and collectors
 5 - Minor street or road (with Road Inventory information, not class 1-4)
 6 - Minor street or road (with minimal Road Inventory information and no street name)

Note: Tracks and Trails (formerly CLASS codes 7 and 8) have been removed from this layer and are now part of the statewide Tracks and Trails datalayer.

The CLASS field was first calculated to 0 for all records and then coded in Oracle SQL*Plus based on the following WHERE clauses:

 1: ADMIN_TYPE = 1 or (FUNCTIONALCLASSIFICATION = 1 and ACCESSCONTROL = 1) or (FUNCTIONALCLASSIFICATION = 2 and ACCESSCONTROL = 1)
 2: CLASS = 0 and ACCESSCONTROL <> 1 and NUMBEROFTRAVELLANES > 1 and OPPOSITENUMBEROFTRAVELLANES > 0 and (RT_NUMBER <> ' ' or RT_NUMBER IS NOT NULL)
 3: CLASS = 0 and (RT_NUMBER <> ' ' or RT_NUMBER NOT LIKE 'N%' or RT_NUMBER IS NOT NULL)
 4: CLASS = 0 and ((FUNCTIONALCLASSIFICATION IN (2,3,5)) or (FUNCTIONALCLASSIFICATION = 1 and ACCESSCONTROL = 1 and ADMIN_TYPE <> 1 ))
 5: (CLASS = 0 and FUNCTIONALCLASSIFICATION IN (0,6)) or (CLASS = 0 and STREET_NAME <> ' ' and STREET_NAME NOT LIKE 'RAMP-RT%' and STREET_NAME IS NOT NULL)
 6: CLASS = 0

ADMIN_TYPE 1-I Type of route in the RT_NUMBER field. Based on the ROUTESYSTEM field. Types are:
 1 - Interstate
 2 - U.S. Highway
 3 - State Route
 0 - Not a numbered route
STREET_NAME 80-C Street name. Same as the STREETNAME field, included for legacy application purposes. In the shapefile downloads this field is STREET_NAM.
RT_NUMBER 4-C Primary route number. Route number of the road type listed in ADMIN_TYPE (where ADMIN_TYPE is 1-3). Based on the ROUTENUMBER field but not including values that begin with "N", which are codes used internally by MassDOT and not actual route numbers.
ALTRTNUM1
ALTRTNUM2
ALTRTNUM3
ALTRTNUM4
 4-C Alternate Route numbers. Type is either U.S. or State route for ALTRTNUM1, as indicated in the ALTRT1TYPE field. All other alternate routes are State routes. No road in the state has more than four alternate routes. These fields were populated using the RoadSegementToRouteList table that was included in the data delivery from MassDOT.
 
ALTRT1TYPE 1-I Administrative Type for the route number in the ALTRTNUM1 field (2 = U.S. Highway, 3 = State Route)
RDTYPE 1-I Expanded version of the CLASS field, with additional values for ramps and tunnels. Values 1 through 6 are the same as CLASS (above). Other values include:
  7 - Ramp [Based on SQL query where (FACILITYTYPE in (7, 8, 9, 10) and STREET_NAME like 'RAMP%' and RT_NUMBER IS NULL and CLASS > 2) or (FACILITYTYPE = 1 and STREET_NAME like 'RAMP%' and RT_NUMBER IS NULL and CLASS > 2)]. Some segments were coded as a ramp based on visual review of the data. In places where CLASS 1 highways intersected with other CLASS 1 highways, connecting ramps were coded RDTYPE = 1.
  8 - Tunnel [Based on SQL query where FACILITYTYPE in (3, 11) and CLASS > 3] 
  9 - Tunnel - Limited Access Highway [Based on SQL query where FACILITYTYPE in (3, 11) and CLASS = 1]
 10 - Tunnel - Multi-lane Highway, not limited access [Based on SQL query where FACILITYTYPE in (3, 11) and CLASS = 2]
 11 - Tunnel - Other Numbered Route [Based on SQL query where FACILITYTYPE in (3, 11) and CLASS = 3]
MGIS_TOWN 1-I Official city or town name

The Major Roads layer EOTMAJROADS_ARC contains only the above fields added by MassGIS except MGIS_TOWN. The CLASS field contains values 1, 2, 3 and 4.

The Major Routes layer EOTMAJROADS_RTE_MAJOR contains only the ADMIN_TYPE and RT_NUMBER fields.

Fields from MassDOT

The other fields in the arc attribute table were included in the data from MassDOT. These include roadway classification, ownership, physical conditions, traffic volumes, pavement conditions, highway performance monitoring information, and more. For details see the Road Inventory Data Dictionary (PDF format, 105 kb).

When downloading the data as a shapefile, please be aware that since the shapefile format only allows for ten characters in field names, the longer Road Inventory File field names have been truncated when converted from an ArcSDE layer to a shapefile. See the conversion chart (PDF format, 8 kb) between the geodatabase field names and the shapefile field names for clarification.

Maintenance

The The Massachusetts Department of Transportation - Office of Transportation Planning regularly updates this layer. MassGIS receives the official MassDOT version and after completing the processing described above makes updated data available once a year. MassDOT's metadata for this dataset may be found at http://www.massdot.state.ma.us/planning/Main/MapsDataandReports/Data/GISData/RoadInventory.aspx. To report errors or changes: http://www.massdot.state.ma.us/planning/Main/MapsDataandReports/Data/DataUpdateProcess.aspx    

In November 2001, roads defined as Tracks and Trails were removed from this layer and placed in their own statewide layer, Tracks and Trails.

The RDTYPE and MGIS_TOWN fields were added in the September 2012 release.

Also see the Limited Access Highway Exits layer.

Since the MassDOT roads do not contain address ranges, they may not be used for address matching (geocoding) in GIS software. The most recent roads data available from MassGIS that may be used for geocoding applications are the TIGER roads from the 2010 U.S. Census.


Last Updated 6/13/2014