SBI Route 150 originally ran from the U.S. 51/60/62 bridges south of Cairo north to Hamel (located northeast of Saint Louis, Missouri) on what is now Illinois Route 3, the portion of Illinois 150 from Chester to Steeleville, and Illinois Route 4.
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A longer concurrency takes place further northeast at Illinois Route 4.
Illinois Route 4 is a long state road that runs south from the Interstate 55 business loop around the state capital of Springfield, south to Illinois Route 13 just north of Murphysboro.
Illinois | University of Illinois at Urbana-Champaign | Peoria, Illinois | Rockford, Illinois | Evanston, Illinois | Springfield, Illinois | Northern Illinois University | Cook County, Illinois | U.S. Route 66 | U.S. Route 1 | Illinois Institute of Technology | Joliet, Illinois | U.S. Route 6 | U.S. Route 101 | Route 66 | Rock Island, Illinois | Belleville, Illinois | Aurora, Illinois | U.S. Route 30 | Southern Illinois University | Quincy, Illinois | New Jersey Route 4 | Illinois River | European route E65 | U.S. Route 40 | Governor of Illinois | California State Route 1 | Wheaton, Illinois | Waukegan, Illinois | Naperville, Illinois |