The Dan Ryan Expressway is a freeway in the city of Chicago that runs from the Circle Interchange with I-290 near downtown Chicago through the South Side of the city. It is designated as both Interstate 94 and Interstate 90 south to 66th Street, a distance of 7.44 miles (11.97 km). It then becomes just Interstate 94 at the split with the Chicago Skyway (which leads to Interstate 90), with a remaining distance of 4.03 miles (6.49 km). This is a total distance of 11.47 miles (18.5 km). The freeway was named for Dan Ryan, Jr., a former president of the Cook County Board of Commissioners.

On an average day, up to 307,100 vehicles use a portion of the Dan Ryan (2005 data).The Dan Ryan, and its North Side counterpart the Kennedy Expressway, are the busiest roads in the entire state of Illinois. Utilizing an express-local system, the Dan Ryan has fourteen lanes of traffic; seven in each direction, with four of those as express lanes and the other three providing access for exit and on-ramps. Despite its width, the Dan Ryan is prone to traffic jams.

Four miles of continuous high-rise housing projects (Stateway Gardens and the Robert Taylor Homes) formerly ran parallel to the expressway on its eastern side from Cermak Road south to Garfield Boulevard. However, nearly all of these buildings have been demolished as part of the CHA's transformation plan.

en.wiki.x.io/wiki/Dan_Ryan_Expressway