Convert Chicago congestion estimates to OSM segments

[thcrock]

The City of Chicago publishes congestion estimates for road segments. The segments themselves seem to be arbitrarily defined and I think we could make better use of the data by converting it to OSM segments first.

There are two open endpoints that are applicable here.

1. The historical congestion estimates.
   https://data.cityofchicago.org/Transportation/Chicago-Traffic-Tracker-Historical-Congestion-Esti/77hq-huss

We should choose a date that correlates with data that we want to look at. We can start with Oct. 6 through 8, 2015, as I've been using those dates for ridership estimation. We will likely end up looking at a bunch of different dates, though.

The problem with this dataset is that it doesn't give you any information about the segments. Which is where the next one comes in:

1. The current congestion estimate

https://data.cityofchicago.org/Transportation/Chicago-Traffic-Tracker-Congestion-Estimates-by-Se/n4j6-wkkf

The segment ids should match between the two datasets, so you can query historical data using the first but look up the segment's geographical data using the second.

Looking up OSM segments can be done either with:

1. OSRM: https://github.com/Project-OSRM/osrm-backend (look up the 'match' endpoint)
2. A PostGIS database with a Chicago OSM extract loaded in.
   https://mapzen.com/data/metro-extracts/ (OSM extract)
   http://wiki.openstreetmap.org/wiki/Osm2pgsql (converting extract to a format PostGIS can read)
   http://postgis.net/ ( PostGIS)