This code has been archved. The Vision-Zero map in this repository which is a leaflet implementation of data taken from ArcGIS, has been replaced with this map https://experience.arcgis.com/experience/bae68e65908f45e1bcc86fe5f089d266/page/ which is hosted and maintained on ArcGIS.
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This repo houses code for Boston's vision zero crash map. The data displayed on the map can be found on the City's open data portal, under vision zero crash records and vision zero fatality records.