StreetLight Data supports the open source and open data communities, and uses open source software and data in our products. When we make changes to these, we publish our changes here to give back to the community and make the code/data available to all.
StreetLight uses data sets derived from OpenStreetmap (license). In particular, we use road segments which we split according to intersection and distance rules. The resulting datasets are available for download here (4.9GB compressed) and here (4.7GB compressed).