St. Clair County Highway R18 is a north-south highway on the eastside of Belleville. This highway is on Greenmount Road. SCCH R18 gives access to Southwestern Illinois University to Illinois State Route 13/15.
NB SCCH R18 north of IL St Rt 13/15. Belleville City Limit sign. SB SCCH R18 just south of IL St Rt 158/177. NB SCCH R18 south of IL St Rt 161. NB SCCH R18 in Shiloh. A BGS on EB I-64/U.S. Rt. 50. A BGS on EB I-64/U.S. Rt. 50. SB SCCH R18 at I-64/U.S. Rt. 50.
