Chicago Traffic Tracker - Congestion Estimates by Segments

Dataset

Name Value
Catalog Link
Metadata Link
Data: JSON 100 Rows
Data: CSV 100 Rows
Host data.cityofchicago.org
Id n4j6-wkkf
Name Chicago Traffic Tracker - Congestion Estimates by Segments
Attribution City of Chicago
Category Transportation
Tags traffic, sustainability
Created 2011-11-20T03:28:25Z
Publication Date 2014-09-26T21:18:26Z

Description

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

| Included | Schema Type    | Field Name  | Name            | Data Type | Render Type |
| ======== | ============== | =========== | =============== | ========= | =========== |
| No       | time           | :updated_at | updated_at      | meta_data | meta_data   |
| Yes      | series tag     | segmentid   | SEGMENTID       | text      | text        |
| Yes      | series tag     | street      | STREET          | text      | text        |
| Yes      | series tag     | direction   | DIRECTION       | text      | text        |
| Yes      | series tag     | fromst      | FROM_STREET     | text      | text        |
| Yes      | series tag     | tost        | TO_STREET       | text      | text        |
| Yes      | numeric metric | length      | LENGTH          | number    | text        |
| Yes      | series tag     | strheading  | STREET_HEADING  | text      | text        |
| Yes      | series tag     | comments    | COMMENTS        | text      | text        |
| Yes      | numeric metric | start_lon   | START_LONGITUDE | number    | text        |
| No       |                | lif_lat     | START_LATITUDE  | number    | text        |
| Yes      | numeric metric | lit_lon     | END_LONGITUDE   | number    | text        |
| No       |                | lit_lat     | END_LATITUDE    | number    | text        |
| Yes      | numeric metric | traffic     | CURRENT_SPEED   | number    | text        |
| Yes      | series tag     | last_updt   | LAST_UPDATED    | text      | text        |

Time Field

Value = updated_at
Format & Zone = seconds

Series Fields

Excluded Fields = lif_lat,lit_lat

Data Commands

series e:n4j6-wkkf d:2017-04-21T07:34:10.000Z t:direction=EB t:street=Garfield t:fromst=Racine t:strheading=W t:tost=Halsted t:last_updt="2017-04-21 02:20:36.0" t:segmentid=8 m:traffic=-1 m:length=0.5 m:start_lon=-87.6548756951 m:lit_lon=-87.6451618298

series e:n4j6-wkkf d:2017-04-21T07:34:10.000Z t:direction=NB t:street=Pulaski t:fromst=Grand t:strheading=N t:tost="North Ave" t:last_updt="2017-04-21 02:20:36.0" t:segmentid=47 m:traffic=16 m:length=0.5 m:start_lon=-87.7262240305 m:lit_lon=-87.7261823777

series e:n4j6-wkkf d:2017-04-21T07:34:10.000Z t:direction=WB t:street=Roosevelt t:fromst=Kedzie t:strheading=W t:tost="Central Park" t:last_updt="2017-04-21 02:20:37.0" t:segmentid=235 m:traffic=-1 m:length=0.5 m:start_lon=-87.7056678592 m:lit_lon=-87.7154194668

Meta Commands

metric m:length p:double l:LENGTH d:"Length of the segment in miles." t:dataTypeName=number

metric m:start_lon p:double l:START_LONGITUDE d:"The 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" t:dataTypeName=number

metric m:lit_lon p:double l:END_LONGITUDE t:dataTypeName=number

metric m:traffic p:integer l:CURRENT_SPEED t:dataTypeName=number

entity e:n4j6-wkkf l:"Chicago Traffic Tracker - Congestion Estimates by Segments" t:attribution="City of Chicago" t:url=https://data.cityofchicago.org/api/views/n4j6-wkkf

property e:n4j6-wkkf t:meta.view v:id=n4j6-wkkf v:category=Transportation v:attributionLink=http://www.chicagotraffictracker.com/ v:averageRating=100 v:name="Chicago Traffic Tracker - Congestion Estimates by Segments" v:attribution="City of Chicago"

property e:n4j6-wkkf t:meta.view.owner v:id=scy9-9wg4 v:profileImageUrlMedium=/api/users/scy9-9wg4/profile_images/THUMB v:profileImageUrlLarge=/api/users/scy9-9wg4/profile_images/LARGE v:screenName=cocadmin v:profileImageUrlSmall=/api/users/scy9-9wg4/profile_images/TINY v:displayName=cocadmin v:privilegesDisabled=false

property e:n4j6-wkkf t:meta.view.tableauthor v:id=scy9-9wg4 v:profileImageUrlMedium=/api/users/scy9-9wg4/profile_images/THUMB v:profileImageUrlLarge=/api/users/scy9-9wg4/profile_images/LARGE v:screenName=cocadmin v:profileImageUrlSmall=/api/users/scy9-9wg4/profile_images/TINY v:roleName=administrator v:displayName=cocadmin v:privilegesDisabled=false

Top Records

| :updated_at | segmentid | street              | direction | fromst     | tost         | length | strheading | comments                                   | start_lon      | lif_lat       | lit_lon        | lit_lat       | traffic | last_updt             | 
| =========== | ========= | =================== | ========= | ========== | ============ | ====== | ========== | ========================================== | ============== | ============= | ============== | ============= | ======= | ===================== | 
| 1492760050  | 8         | Garfield            | EB        | Racine     | Halsted      | 0.5    | W          |                                            | -87.6548756951 | 41.7940346735 | -87.6451618298 | 41.7941646462 | -1      | 2017-04-21 02:20:36.0 | 
| 1492760050  | 47        | Pulaski             | NB        | Grand      | North Ave    | 0.5    | N          |                                            | -87.7262240305 | 41.9061550576 | -87.7261823777 | 41.9098857185 | 16      | 2017-04-21 02:20:36.0 | 
| 1492760050  | 235       | Roosevelt           | WB        | Kedzie     | Central Park | 0.5    | W          |                                            | -87.7056678592 | 41.8665425122 | -87.7154194668 | 41.8664270139 | -1      | 2017-04-21 02:20:37.0 | 
| 1492760050  | 342       | Western             | NB        | 51st       | 47th         | 0.5    | S          | Western Blvd Run Parallel on the East Side | -87.684040664  | 41.8011451454 | -87.6842419673 | 41.8084247143 | 26      | 2017-04-21 02:20:37.0 | 
| 1492760050  | 949       | Washington          | WB        | Western    | California   | 0.5    | W          |                                            | -87.686483181  | 41.8831334079 | -87.696333691  | 41.8830349349 | -1      | 2017-04-21 02:20:40.0 | 
| 1411741096  | 1002      | Touhy               | EB        | California | Western      | 0.48   | W          |                                            | -87.6997466265 | 42.0119763841 | -87.6902422854 | 42.0121628852 | -1      | 2011-10-28 11:50:50.0 | 
| 1492760050  | 693       | Dr Martin L King Jr | NB        | Garfield   | 51st         | 0.51   | S          |                                            | -87.615791142  | 41.7946755473 | -87.6159748727 | 41.8021096226 | -1      | 2017-04-21 02:20:38.0 | 
| 1411741096  | 1004      | Touhy               | EB        | Rogers     | Clark        | 0.41   | W          |                                            | -87.6826977229 | 42.0123768207 | -87.6746953394 | 42.0125192492 | -1      | 2010-07-21 14:51:08.0 | 
| 1411741096  | 1005      | Touhy               | EB        | Clark      | Sheridan     | 0.57   | W          |                                            | -87.6746953394 | 42.0125192492 | -87.6634484746 | 42.0127106157 | -1      | 2010-07-21 14:51:08.0 | 
| 1411741096  | 1006      | Touhy               | WB        | Mannheim   | I-90 Expy    | 0.98   | W          | outside city limits                        | -87.885791874  | 42.0097669164 | -87.9048826492 | 42.0090329667 | -1      | 2010-07-21 14:51:10.0 |