CHICAGO (CBS) — Chicago has the dubious distinction of having the worst bottleneck for truckers in the country.

A study of truck traffic found that the Circle Interchange–where the Dan Ryan, Kennedy and Eisenhower expressways meet–is the worst in the United States.

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The average speed through the “spaghetti bowl”–named for all of the ramps that connect the three expressways–is 29 miles per hour.

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Two other Chicago area bottlenecks also made the top ten.

Coming in at No. 6 is the Interstate 65 and Interstate 80 exchange in Gary, Ind. At No. 8: the Kennedy-Edens expressway junction on the North Side.

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The study was done by the American Transportation Research Institute and the Federal Highway Administration.