The Chicago Traffic Tracker(beta) website is presented by the Chicago Department of Transportation
(CDOT). The beta version of the website provides real-time traffic conditions on the arterial streets, Average Daily Traffic (ADT) volumes,
traffic signal locations, pedestrian counts, and automated red-light enforcement
program intersections throughout the city. As the site develops we will enhance the website features with travel times, live images from traffic cameras,
planned and un-planned roadway incidents and much more.
Navigation within the map
This website uses Google MAP API to display the relevant locations on the map. It is possible to pan and zoom the map by clicking the appropriate
control buttons on the top left corner of the map. The +/- buttons allows to perform zoom-in and zoom-out functions while the four arrows allow to pan
the map left, right, up and down. Alternatively, scrolling the map is possible by holding down the left mouse button and dragging the map
in any direction. Moving the mouse wheel forward and backward will zoom the map view in and out. Double clicking anywhere on the map will
zoom the map one level.
Users can toggle between a map view, aerial view (satellite images) and a hybrid view (a combination of aerial and map views) by
clicking the appropriate button on the top right corner of the map. Users may also get a street level view of a location by dragging and
dropping the "Street View" icon at the desired location on the map.
Real-time Traffic, ADT, Signals, Red Light Camera, and City Boundary layers can be turned on and off individually by checking or un-checking the box next
to each layer name on the left panel. Turning on multiple layers simultaneously will significantly affect the performance of the webpage.
Be sure to turn off layers that are not necessary. The delay in displaying multiple layers simultaneously depends on the user's system, connection speed
and the Internet browser used. There is no need to refresh the page to view updates to the real-time traffic. This layer is automatically updated when turned on.
The following color scheme is use for displaying segment speeds on the map:
over 20 mph
10 to 20 mph
below 10 mph
Viewing Detailed Information About a Location(marker point):
Each marker on the map, when displayed, represents the location of the relevant item. When the mouse pointer is placed on top of the marker, the name of the intersection
or address of the locations is displayed. Clicking on a marker will reveal a pop-up window which shows additional information on the selected item.
Clicking on the “x” button in the pop-up window closes the pop-up window.
Zooming in to View All Markers:
To reveal all of the markers, the map must be zoomed to level 16 or higher. The zoom level is shown in the panel to the left of the map.
At zoom levels below 16, some markers will not be displayed. This system helps to avoid displaying too much information on the map and also
aid in speedy display of the map. No additional markers are revealed at zoom levels above 16.
Zooming to a Specific Location:
The two drop-down menus above the map allow you to navigate directly to an intersection or a landmark. Select two intersecting streets or a landmark
from these menus and click the button. The map will shif its focus and zoom-in to the selected location.
This site is best viewed using Mozilla Firefox or Google Chrome web browser.
Optimum screen resolution: 1280 x 1024 pixels.
A minimum of 500 MB of RAM is recommended to view this site without significant delay in loading the page.
Windows 2000 or later versions of Windows operating system is recommended.
For additional information contact the CDOT Division of Project Development at: 30 N LaSalle St, Suite 500, Chicago, IL 60602. PH: 312-744-7650
Feedback and comments may be addressed to: TrafficTracker@cityofchicago.org