In 2023, the Francis Scott Key Bridge carried 12.5 million vehicles, averaging over 34,000 vehicles per day, which accounted for 15% of the total traffic at the harbor crossings. Following the bridge's collapse on March 6, 2024, BMC received numerous inquiries about the impact on regional traffic.
In response, BMC staff analyzed the effects of this loss using vehicle probe data from RITIS (Regional Integrated Traffic Information System), provided by the University of Maryland Center for Advanced Transportation Technology (CATT) Lab. The analysis focused on routes where congestion had increased by at least 25% since the collapse.
The following reports monitor the monthly changes in congestion and show the trends at each of 16 locations with a Congestion Percentage below 75%. Congestion Percentage is defined as the percentage of free flow speed.