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Top Crash Locations and Maps

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Traffic Engineering


MassDOT Highway Division obtains crash data from the MassDOT Registry of Motor Vehicles (RMV) Division (the agency responsible for collecting State and local police crash reports and entering and maintaining crash data records) and uses them for a number of purposes. The primary function is to provide a foundation for making informed decisions for selecting and developing safety improvement projects. The Top High Crash Locations Report and interactive maps are some of the tools used in this process.

The 2015 Top Crash Locations Report contains the most up-to-date crash data available to the Department as of October 2017.

MassDOT Interactive Crash Cluster Map

The MassDOT Highway Division also maintains an interactive map showing the Top Crash Locations. The interactive map contains a number of different map layers which can be viewed by clicking on the word "MAP TYPE/LEGEND" to see the various options (Top 200 Intersection Clusters, HSIP clusters, HSIP pedestrian clusters, HSIP bicycle clusters, etc.).

Crash Geocoding

To produce the high crash locations listing and the interactive maps, MassDOT Highway Division has developed an automated procedure for processing, standardizing, matching and aggregating the crash data by geographical location using Geographic Information System (GIS) tools and procedures. This is solely based on crashes that have been entered into the crash system and geolocated. Generally, the geocoding rate (the rate at which crashes can be located to a specific geographical point) for crashes between 2013 and 2015 is over 96%. However, the geocoding rate is not uniform for all crashes or for all types of crash locations. For details on the geocoding issues and crash clustering and ranking process, refer to one of the annual Top Crash Locations Reports.

Highway Safety Improvement Program Eligibility

Using these tools, the MassDOT Highway Division is able to identify locations that are eligible for Highway Safety Improvement Program (HSIP) funding. An HSIP-eligible location is a crash cluster that ranks within the Top 5% of each Regional Planning Agency, based on a combination of factors including crash incidence and severity (Using the Equivalent Property Damage Only (EPDO) index where Property Damage Only crashes = 1 Point; Injury crashes = 5 Points; Fatal crashes = 10 points). The interactive map contains the various HSIP map layers. Refer to the HSIP Page for more details.

For further information, please contact Neil Boudreau, Assistant Administrator for Traffic and Safety, Traffic and Safety Engineering Section, MassDOT Highway Division, 10 Park Plaza, Room 7210, Boston, MA 02116, (857) 368-9655.


It should be noted that the Top 200 High Crash Intersection Locations Report was compiled under the authority of United States Code Title 23, Section 148, Highway Safety Improvement Program, sponsored by the Federal Highway Administration. The compilation of such information is, therefore, subject to the limitations of Section 148 (g) (4) which states:

"Discovery and admission into evidence of certain reports, surveys, and information - Notwithstanding any other provision of law, reports, surveys, schedules, lists, or data compiled or collected for any purpose relating to this section, shall not be subject to discovery or admitted into evidence in a Federal or State court proceeding or considered for other purposes in any action for damages arising from any occurrence at a location identified or addressed in such reports, surveys, schedules, lists or other data."


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