sentences:  The bridge carried 77% of all the automobiles and 23% of the commercial vehicles that commuted into the Loop each day.There were several plans starting in the 1880s for improving Michigan Avenue that involved Rush Street, but nothing came of any of them.The final Rush Street Bridge was not designed for automobile traffic, which caused congestion on the south bank of the River where both Michigan and Wabash fed onto River Street (now Wacker Drive).