^Eastbound trailblazer leading away from exit 261, April 2022.
Interstate 55 begins in Chicago along Lake Shore Drive (US Route 41) and heads southwest along the former route of US Route 66, crossing the Mississippi River into St. Louis, Missouri. It passes along Joliet's western flank and connects to Normal, Bloomington, and Springfield before it reaches the St. Louis metroplex.
Exit 240 is for Lorenzo Road, a local road that runs westward toward Morris:
Exit 241 is a fountain interchange leading to North River Road, a county road useful for accessing Wilmington:
Exit 244 accesses Arsenal Road, giving trucks a roadway connection to two intermodal freight terminals (creating mind-bogglingly high amounts of truck traffic in the Joliet area):
Exit 247 links to Bluff Road in Channahon:
Exit 248 provides a connection to US Route 6 in Channahon, but signage only points to Morris and Joliet as control cities:
Exit 250A is the first half of a cloverleaf to Interstate 80, and this ramp accesses Interstate 80 east toward "Indiana":
Exit 250B loops around to access Interstate 80 west, toward "Iowa":
Exit 251 creates the southern start of Illinois 59 toward Plainfield and Shorewood, but it only connects to Interstate 55 to/from the south:
Exit 253 accesses US Route 52, linking to Joliet and Shorewood:
Exit 257 connects to US Route 30 alongside Plainfield, but signs only point to Aurora and Joliet:
Exit 261 is the eastern end of Illinois 126, marking a curve into an east-northeast alignment that Interstate 55 follows until its very end, and the partial interchange only allows Illinois 126 to/from the east-northeast: