A simple chart in one place.
This figure was a nice-looking variant to a paper that was ultimately accepted in EEJ. This figure itself didn’t make it, but it is a really good-looking one. This is a heat map of all accidents in NYC, from July 2012 through March 2019. Black areas are few accidents, and the brighter areas are more accidents. The roads are highlighted in pink to match. It’s fairly obvious that the bulk of accidents are in Manhattan and only a few are in Staten Island.
Mammen, K., Shim, H. S., & Weber, B. S. (2019). Vision Zero: Speed Limit Reduction and Traffic Injury Prevention in New York City. Eastern Economic Journal, 1-19.
Made in QGIS.