I-495 bridge closure, Wilmington, Delaware (2014)
Four support columns on the I-495 bridge over the Christina River were found tilting, forcing an indefinite closure of a key north-south freeway. Traffic detoured through city streets for months while engineers stabilized the structure.
An 11-mile detour diverted commuter and truck traffic onto local roads, causing severe congestion throughout the Wilmington metro area.
The bridge reopened after emergency repairs, and the episode became a case study in how a single freeway point failure ripples across a region.
The Livernois closure is planned and short by comparison, but it shows the same mechanism: one shut exit pushes traffic onto surface streets and can back up an entire corridor during peak hours.
