SparkyData

Articles

Each article takes one question about New York City and works out what the public data can say about it. Every article ships with interactive charts, the dataset it used and the code that reproduces its numbers, and lists the source of every external figure it quotes.

trafficroad safetye-bikes

Fewer road deaths, except on two wheels: thirty years of traffic deaths in New York

Far fewer people are killed on New York City's streets on foot and in cars than thirty years ago, but more on two wheels. Traffic deaths fell from about 415 a year in the late 1990s to 240 in the early 2020s, while deaths on motorcycles, mopeds, motor scooters and bicycles rose from about 47 a year to 71. This year, to 11 October, the NYPD counts 151 traffic deaths, against 155 a year earlier.

How articles work

  • Reproducible. The numbers in an article are computed by its code from its companion dataset — not typed in.
  • Sourced. Every figure quoted from elsewhere links to the table it came from, with its vintage and margin of error.
  • Labelled. Each number says whether it was measured in one survey, estimated across two, or assumed — and every chart says what it cannot show.
  • Interactive. The charts can be filtered and re-cut in the browser; every combination they can reach was computed in advance from the data, with its margin.