Abstract: The Massachusetts Department of Transportation Highway Division Traffic Inventory contains the spatial linework for all the public and a good portion of the private roadways in Massachusetts, along with roadway attributes covering the roadway classification, ownership, traffic volumes, and more.

Functional Classification refers to the character of services that a particular roadway is intended to provide. In general, roads either serve to provide mobility for vehicles or access to locations. The process of functional classification was mandated by Intermodal Surface Transportation Efficiency Act of 1991 (ISTEA) and implemented in 1993 by the Office of Transportation Planning in cooperation with the 13 Regional Planning Agencies. Roadways are divided into the following three classification categories:Arterials: These roadways provide the highest level of mobility at the greatest vehicular speed for the longest uninterrupted distances and are not intended to provide access to specific locations. Arterials are further subdivided into Principal Arterials and Minor Arterials. However, for the purposes of this report they have been grouped together. Please note that Interstates are considered Arterials, but they have been given their own category in this report.Collectors: These roadways provide some level of both mobility and access. They collect traffic from Local roads and funnel it to Arterials. In rural areas, collectors are further subdivided into Major Collectors and Minor Collectors, but for the purposes of this report they have been grouped together.Locals: These roadways provide access to abutting land with little or no emphasis on mobility. The termLocal road should not be confused with local jurisdiction. Most, but not all, functionally classified Local roads are under city/town jurisdiction.

This map service contains bridge data from the Massachusetts Department of Transportation Highway Division (MassDOT) Bridge Inspection Management System (BIMS). The data is refreshed from the BIMS database on a biweekly basis. Included in this layer are: • MassDOT and municipally-owned structures with spans greater than 20 feet. These are categorized as National Bridge Inventory (NBI) structures. MassDOT inspects NBI bridges on a biannual basis. • MassDOT Highway and municipally-owned short span bridges with spans between 10 to 20 feet. These are categorized as “BRI” structures. The first complete Inspection of the short span bridge inventory is currently in progress. • MassDOT Highway and municipally-owned Culverts with spans of 4 to 10 feet. This category is incomplete and an inventory effort is underway. Structures under Federal, other State entities or Private ownership are not contained in this layer. Also excluded are minor non-highway structures such as pedestrian and bicycle overpasses. Access and Use Constraints The Massachusetts Department of Transportation shall not be held liable for any errors in this data. This includes errors of omission, commission, errors concerning the content of the data, and relative and positional accuracy of the data. This data cannot be construed to be a legal document. Primary sources from which this data was compiled must be consulted for verification of information contained in this data.

These raster datasets are derived from output of the Massachusetts Coast Flood Risk Model (MC-FRM) for Present Day - defined by the tidal epoch centered on 2008 (1999 to 2017), 2030, 2050, and 2070 sea level rise and coastal storm simulations as described in the report "Assessing the vulnerability of MassDOT’s coastal transportation systems to future sea level rise and coastal storms, and developing conceptual adaptation strategies" (2020). For each of these four sea level conditions the model output is provided as four separate raster datasets: (1) coastal flood exceedance probabilities (CFEP), (2) flood depths for 1% CFEP, (3) flood depths for 0.5% CFEP, and (4) flood depths for 0.1% CFEP. Details of the project and model are described in the final project report cited herein (Bosma, et. al., 2020).

A culvert is a structure that allows water to flow under a road, railroad, trail, or similar obstruction from one side to the other side. Typically embedded so as to be surrounded by soil, a culvert may be made from a pipe, reinforced concrete or other material.

Airports in the state of Massachusetts generated from tabular data provided by the MassDOT Aeronautics Division. This display summarizes the facilities and services found at each location.

This is a point feature layer of all sign assets along highways in Massachusetts. each point represents a sign feature at a specific location. Each sign contains a variety of attribute information including an identifier, physical characteristics, Manual on Uniform Traffic Control Devices (MUTCD) relevant information, service status, and any relevant support information.

This point layer contains the milepost locations on numbered routes throughout the state of Massachusetts. Milepoints/mileposts are point features are present on numbered routes throughout the state and run along the road network. Data includes geographic coordinates of the features.

Interchanges has one point representing all the ramps. The point is located on the primary side of the route at the point where the second route crosses.This data has been updated to completion in account for the State's recent exit renumbering project. All interchange exit numbers should reflect the updated exit numbers. Former exit numbers can be found in the 'Legacy Exit Number' field.

The pedestrian dataset is a layer that aims to delineate the position and quality of pedestrian facilities throughout the commonwealth of Massachusetts. Using aerial photography, pedestrian facilities were created to display the presence of right, left or both sides of the road. Sidewalk widths are included.

The Massachusetts Vehicle Census (MVC) is the first state-level dataset in the nation that joins vehicle-level odometer readings with vehicle attribute and registration transaction histories. This powerful resource allows policymakers, researchers, and other stakeholders understand state and local trends in vehicle usage and ownership.

Geodetic control points. Publication data for read only apps.

This polygon datalayer contains the fifteen Massachusetts Department of Transportation (MassDOT) Regional Transit Authorities (RTAs) in the Commonwealth of Massachusetts. These administrative districts manage the operations of the public transit systems within their jurisdiction and implement maintenance programs. The bounds of the MassDOT RTA Districts were digitized from the MassGIS survey level town boundaries. In addition to the polygon layers, there is an Arc version following the same linework as the polygon

This point data layer contains the locations of passenger and freight seaport locations in Massachusetts. This layer denotes whether a seaport transports freight and/or passengers and whether it is part of the National Highway System (NHS).ProductionThe locations of the seaports were digitized from the Commonwealth of Massachusetts 1:5000 color orthophoto imagery.MetadataStatusThis data is current as of June 2005

This layer is part of MassDOT's Stormwater Asset Database used to map MassDOT's drainage network assets.

Standardized data sets produced from the Massachusetts Coast Flood Risk Model (MC-FRM) include annual exceedance probability (AEP) ARC-GIS based rasters across all modeled climate time horizons, and depth of flooding at three AEP levels across all modeled climate time horizons (present day, 2030, 2050, and 2070). However, additional non-standardized datasets were requested by the Massachusetts Executive Office of Energy and Environmental Affairs (EEA) to be utilized in the development of climate resiliency tools for the State of Massachusetts. These datasets were produced using the same probabilistic modeling framework created and utilized for the original MC-FRM and Boston Harbor Flood Risk Model (BH-FRM) datasets. These new non-standardized data consist of (1) Water Surface Elevations, (2) Maximum Wave Heights, and (3) calculations of Design Flood Elevations (DFEs). These were determined for six (6) selected annual exceedance probabilities (AEPs) and three (3) time horizons. Additionally, EEA also requested (4) development of Tidal Benchmarks across the state for 2030, 2050, and 2070 projected future sea level rise conditions. For these requested outputs, Woods Hole Group created a set of geographic data features and raster datasets. These datasets were calculated directly from the MC-FRM model simulation results but required additional calculation and processing efforts to create the required GIS based outputs.

This pointdata layercontains the locations of rest areas within Massachusetts maintained by the Massachusetts Department of Transportation (MassDOT) Highway Division. This layer denotes visitor center rest areas, parkingcapacity, restroom availability, and other features that might be present.ProductionThe locations of the rest areas were digitized from the Commonwealth of Massachusetts 1:5000 color orthophoto imagery.MetadataStatusThis data is current as of January 2012.

This data is updated nightly and the data in this layer is subject to change at any time and are not to be considered up-to-date or complete.

Data current as of 12/3/2021

Standardized data sets produced from the Massachusetts Coast Flood Risk Model (MC-FRM) include annual exceedance probability (AEP) ARC-GIS based rasters across all modeled climate time horizons, and depth of flooding at three AEP levels across all modeled climate time horizons (present day, 2030, 2050, and 2070). However, additional non-standardized datasets were requested by the Massachusetts Executive Office of Energy and Environmental Affairs (EEA) to be utilized in the development of climate resiliency tools for the State of Massachusetts. These datasets were produced using the same probabilistic modeling framework created and utilized for the original MC-FRM and Boston Harbor Flood Risk Model (BH-FRM) datasets. These new non-standardized data consist of (1) Water Surface Elevations, (2) Maximum Wave Heights, and (3) calculations of Design Flood Elevations (DFEs). These were determined for six (6) selected annual exceedance probabilities (AEPs) and three (3) time horizons. Additionally, EEA also requested (4) development of Tidal Benchmarks across the state for 2030, 2050, and 2070 projected future sea level rise conditions. For these requested outputs, Woods Hole Group created a set of geographic data features and raster datasets. These datasets were calculated directly from the MC-FRM model simulation results but required additional calculation and processing efforts to create the required GIS based outputs.