Chicago Traffic Tracker

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

Categories: ,
Complexity

Two types of congestion estimates are produced every ten minutes:

– by Traffic Segments
– 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).

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.

Date Created

2011-11-20

Last Modified

2020-03-25

Version

2020-03-25

Update Frequency

Continuous

Temporal Coverage

2020

Spatial Coverage

Chicago

Source

John Snow Labs; Chicago Data Portal;

Source License URL

Source License Requirements

N/A

Source Citation

N/A

Keywords

Traffic Segment, Congestion by Traffic Region, Traffic Segment Speed, Traffic Congestion by Speed, Violation in Traffic, Violation in Traffic Segment, Traffic, Traffic Region, Chicago Traffic Tracker

Other Titles

Chicago Traffic Tracker ‒ Congestion Estimates by Traffic Segments, Chicago Transit Authority

NameDescriptionTypeConstraints
Segment_IDUnique arbitrary number to represent each segment.string-
Street_NameStreet name of the traffic segment.string-
DirectionTraffic flow direction for the segment.string-
From_StreetStart street for the segment in the direction of traffic flow.string-
To_StreetEnd street for the segment in the direction of traffic flow.string-
LengthLength of the segment in miles.numberlevel : Ratio
Street_HeadingThe position of the segment in the address grid. North, South, East, or West of State and Madison.string-
CommentsAdditional Comments for the segmentstring-
LatitudeLatitude points represent the start and end points 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.number-
LongitudeLongitude points represent the start and end points 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.number-
Current_SpeedReal-time estimated speed in miles per hour. For congestion advisory and traffic maps, this value is compared to a 0-9, 10-20, and 21 & over scale to display heavy, medium, and free flow conditions for the traffic segment. Except for a very few segments speed on city arterials is limited to 30 mph by ordinance. A reliable number of GPS traces are required for estimating speed for a segment.integerlevel : Ratio
Last_UpdatedTime when data was last updatedstring-
Segment IDStreet NameDirectionFrom StreetTo StreetLengthStreet HeadingCommentsLatitudeLongitudeCurrent SpeedLast Updated
1284ChicagoWBLake Shore DrMichigan0.37E41.896936-87.617048-100:00.0
951WashingtonWBKedzieSchraeder0.28W41.88293153-87.70616912-151:00.0
750ElstonSEMilwaukeeAustin0.33N41.9926646-87.78322435-151:10.0
1164HarlemSBOgdenPershing0.17302284399999998SOutside City Limits41.82375081-87.80292191-151:15.0
1122127thEBWesternI-57 Expy0.9078922220000001WOutside City Limits41.66251165-87.68007697-151:06.0
682Dr Martin L King JrNBBishop Ford Expy95th0.58S41.71344133-87.61377146-150:44.0
794HollywoodWBLake Shore DrRidge0.45Wpart of Peterson41.98553395-87.6535172-150:56.0
964Ramp To KennedyWBOrleansKennedy Expy0.57WOneway41.89315033-87.63709952-151:01.0
701Dr Martin L King JrSB95thBishop Ford Expy0.58S41.72185768-87.61433809-150:45.0
43231stEBDan Ryan ExpyState0.49W41.83807234-87.63039364-150:26.0
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