Interstate 172 is a north-south highway in Western Illinois. This is known as the Quincy By-Pass of officially as the "Frank Strieby Expressway". It runs from the Central Illinois Expressway (Interstate 72/U.S. Rt. 36) to U.S. Rt. 24/Illinois State Route 336, northeast of Quincy.
The Illinois Department of Transportion has I-172 at a length of 18.89 miles. Future reaches of this highway may one day finish the Quincy-Macomb-Peoria Freeway. Plus, the Chicago-Kansas City highway.
From U.S. Rt. 24, north, the highway continues as Illinois State Route 336, into Hancock County. It is a four-lane highway with at-grade intersection. The speed limit is 65 M.P.H. In Illinois, I-172 is not multi-plexed. Interstate 172 intersects the following interstate in Illinois.
Info on the parent highway of I-172. The southern end marker. A BGS on EB IL St Rt 106. NB I-172 north of the interchange with I-72. The first NB guide marker. A NB guide marker. NB I-172 north of IL St Rt 57. NB I-172 near Marblehead. A junction maker on WB IL St Rt 104. A BGS on EB IL St Rt 104. NB I-172 northeast of Quincy. The northern end of I-172. The northern end marker. A close-up of the northern end marker.
