From Madison, WI:
Take I-90/94 South to I-39 at Rockford, IL. Take I-39 South to I-55 at Bloomington-Normal; take I-55 South to Exit 160-B, West on Route 9 (Market Street). ; go 3/4 mile; turn right into the Interstate Center.

From Des Moines, IA:
Take I-80 East to I-74 at Moline, IL;  Take I-74 East to I-55, go South to Exit 160-B, Route 9 (Market Street). go West 3/4 mile; turn right into the Interstate Center

From Indianapolis, IN:
Take I-74 West to Bloomington-Normal, IL and meet I-55 North; take I-55/74 to Exit 160-B; go West on IL Route 9  for ¾  of a mile; turn right into the Interstate Center.

From St. Louis, MO:
Take I-55 North to Bloomington-Normal, IL; take Exit 160-B West on IL Route 9 for ¾ of a mile; turn right into the Interstate Center.

From Chicago, IL.:
Take I-55 South to Bloomington-Normal, IL; take Exit 160-B West on IL Route 9 for ¾ of a mile; turn right into the Interstate Center.