Illinois Route 1 is the longest state highway in Illinois, running from Chicago south to a ferry across the Ohio River into Kentucky. For most of its length, it is the easternmost north-south highway in Illinois. It passes through Chicago's south side, many southern suburbs, Danville, Mount Carmel, and other towns.
Illinois 1's northern end is an interchange with Interstate 57's northernmost segment, and it gets its start heading south on Halsted Street on Chicago's South Side:
Illinois 1 crosses Illinois 83 where Harvey meets Riverdale:
Between Crete and Beecher, Illinois 1 joins Illinois 394 south for a short distance:
IDOT decided to stop building the four-lane Illinois 394 at Goodenow Road, a seemingly random traffic signal in Will County. As a result, Illinois 394 ends here as Illinois 1 continues south as a simple two-lane highway:
At the town of Grant Park, Illinois, Illinois 17 comes from the east to join Illinois 1 south...