I'm looking for historical traffic data on a decently large city.
Specifically I need data points that can be used to infer the distribution of vehicle speeds across each road, but I don't want the data to be pre-processed (i.e., it should be coming in the form of individual samples, instead of pre-fit distributions to the data).
It doesn't really matter where the data is from, any major city should be fine -- I just need the the traffic pattern to be interesting for analysis.

Is there any source from which I can obtain such data for free and without too much difficulty?
(Ideally it wouldn't be too difficult to map the roads to those from OpenStreetMaps.)

  • Define a "decently large city." London, UK or Mexico City.
    – Mapperz
    Commented Jun 12, 2014 at 4:15
  • @Mapperz: I mean something with an interesting traffic pattern, where routing is actually a problem of interest. San Francisco, Luxembourg, etc. would be great.
    – user541686
    Commented Jun 12, 2014 at 4:15
  • like dot.ca.gov/dist4/highwayops/hoindex.html
    – Mapperz
    Commented Jun 12, 2014 at 4:18
  • @Mapperz: I can't find anything on that page that has raw data. It only seems to be the average over many vehicles, which tells me nothing about the shapes of the distributions. Maybe I missed what part of the page you were referring to?
    – user541686
    Commented Jun 12, 2014 at 4:33
  • 1
    To obtain raw data, you may have to call the specific DOT you are interested in getting data for.
    – artwork21
    Commented Jun 12, 2014 at 12:37

1 Answer 1


Here is some historic traffic data from San Francisco:




  • Thanks, appreciate it. Unfortunately it doesn't look like they have individual vehicle speeds, but are rather just reporting total counts and mean/standard deviations which isn't what I was looking for.
    – user541686
    Commented Jun 12, 2014 at 18:55

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