Chicago Tracker

Weeks start on Sunday. One thing is counted once per place per day, and something that runs for days counts on the day it started. Brief lane blocks that cleared inside an hour are left out, closures scheduled to run longer than a week are roadworks rather than incidents, an outage counts when it left 10 or more customers without power, and stories about policy or funding are not incidents.

Areas are measured from State and Madison, where Chicago's street numbering starts: within 2 miles is Downtown and the Loop. Inside city limits the rest is the North, Northwest, West, Southwest or South Side, by direction from the Loop; outside them it is the matching suburbs, or Northwest Indiana. An item with no coordinates is counted in the totals but not placed on the map. Corridors come from the road a source named, called by the name Chicagoans use (the Kennedy, the Dan Ryan, the Eisenhower, Lake Shore Drive). A bare interstate number is split into the stretch north, south or west of the Loop. Only road incidents and construction are placed on corridors. Wards and community areas are both the City of Chicago's own boundaries, from its Data Portal, and each ward is named here by the community areas it mostly covers. They cover the City of Chicago only, so anything in Evanston, Naperville, Schaumburg, Gary or elsewhere in the metro belongs to neither and is not in this view.