The city of Boston publishes a lot of data on their open data hub . One of the the recently released datasets is their crash records . It contains the date, time and location for all incidents where a public safety response was dispatched. I made an app that puts the locations on a map where you can filter by crash type, year, month, day of the week and time of day. The app url is boston-crash-map.herokuapp.com and the source code is on github here .