Chicago Arterial Street Congestion Estimates by 29 Traffic Regions

Real-time congestion estimates for 29 traffic regions across Chicago's arterial street network, produced every 10 minutes. The Chicago Traffic Tracker generates this data by continuously monitoring and analyzing GPS traces from Chicago Transit Authority (CTA) buses. The dataset provides average traffic conditions for regions, which are more stable than individual segment speeds, to give a better understanding of city-wide traffic patterns.

Use Cases

• Model real-time traffic patterns using REGION, CURRENT_SPEED, and LAST_UPDATED columns.
• Visualize congestion on a map using REGION_ID and the bounding box columns (NORTH, SOUTH, EAST, WEST).
• Analyze temporal trends in regional congestion by aggregating CURRENT_SPEED over LAST_UPDATED timestamps.
• Correlate traffic conditions with geographic areas using REGION and DESCRIPTION fields.

Strengths

• Data is updated every 10 minutes, providing near real-time insights.
• Covers 29 traffic regions designed to represent comparable traffic patterns across the entire city.
• Based on continuous GPS monitoring from a large fleet of CTA buses.

Limitations

• Row count is unknown, which may limit suitability assessment.
• Covers only arterial (non-freeway) streets; congestion on highways is not included.
• Last updated 2026-04-03 21:33:24; freshness should be verified.

Provenance

Source

data.cityofchicago.org

Collection Method

Real-time analysis of GPS traces from Chicago Transit Authority (CTA) buses.

Freshness

Updated every 10 minutes according to the description.

Geography

City of Chicago, Illinois, USA (except O’Hare airport area).