Rush hour in Cincinnati is the worst, especially if you're trying to cross the Brent Spence Bridge from either side of the river. It seems that no matter the time of day, the I-75 at I-74 and the I-75/I-71 at I-275 interchanges are always congested.
The Brent Spence Bridge, which is the cause of those traffic jams, recently made American Transporation Research Institute
's list of top 100 bottlenecks in the country, coming in at no. 35 and no. 84, respectively.
Since 2002, the ATRI has collected and processed GPS data from trucks to help support the Federal Highway Administration's Freight Performance Measures initiative, which collects and monitors key performance measures of the country's freight transportation system.
See the full list of the country's worst 100 bottleneck interchanges here