cityofchicago/chicago-traffic-tracker-congestion-estimates-by-n4j6-wkkf
 
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Chicago Traffic Tracker - Congestion Estimates by Segments

This dataset contains the current estimated speed for about 1250 segments covering 300 miles of arterial roads. For a more detailed description, go to: http://bit.ly/Q9AZAD.

The Chicago Traffic Tracker estimates traffic congestion on Chicago’s arterial streets (nonfreeway

streets) in real-time by continuously monitoring and analyzing GPS traces received from Chicago Transit Authority (CTA) buses. Two types of congestion estimates are produced every ten minutes: 1) by Traffic Segments and 2) by Traffic Regions or Zones. Congestion estimate by traffic segments gives the observed speed typically for one-half mile of a street in one direction of traffic.

Traffic Segment level congestion is available for about 300 miles of principal arterials. Congestion by Traffic Region gives the average traffic condition for all arterial street segments within a region. A traffic region is comprised of two or three community areas with comparable traffic patterns. 29 regions are created to cover the entire city (except O’Hare airport area).

This dataset contains the current estimated speed for about 1250 segments covering 300 miles of arterial roads.

There is much volatility in traffic segment speed. However, the congestion estimates for the traffic regions remain consistent for relatively longer period. Most volatility in arterial speed comes from the very nature of the arterials themselves. Due to a myriad of factors, including but not limited to frequent

intersections, traffic signals, transit movements, availability of alternative routes, crashes, short length of the segments, etc. speed on individual arterial segments can fluctuate from heavily congested to no congestion and back in a few minutes. The segment speed and traffic region congestion estimates

together may give a better understanding of the actual traffic conditions.

Columns

NameSocrata field nameColumn name in sgr mountData typeDescription
TO_STREET_tost_tostTextEnd street for the segment in the direction of traffic flow.
FROM_STREET_fromst_fromstTextStart street for the segment in the direction of traffic flow.
CURRENT_SPEED_traffic_trafficTextA value of -1 means no estimate is available.
START_LONGITUDEstart_lonstart_lonTextThe longitude associated with the starting point of the segment in the direction of traffic flow. For two-way streets it is roughly at the middle of the half that the segment is representing. For one-way streets this is the street center line. The startin
SEGMENTIDsegmentidsegmentidTextUnique arbitrary number to represent each segment.
COMMENTS_comments_commentsText
STREET_HEADING_strheading_strheadingTextThe position of the segment in the address grid. North, South, East, or West of State and Madison.
DIRECTION_direction_directionTextTraffic flow direction for the segment.
LENGTH_length_lengthTextLength of the segment in miles.
END_LATITUDE_lit_lat_lit_latText
END_LONGITUDE_lit_lon_lit_lonText
START_LATITUDE_lif_lat_lif_latText
LAST_UPDATED_last_updt_last_updtText
STREETstreetstreetTextStreet name of the traffic segment.
Upstream Metadata