Interstate 474 is a freeway bypass of Peoria, around that city's southwestern side, providing an alternative to Interstate 74, which spears through the center of town. Interstate 474 has both of its ends at Interstate 74, and it is about fifteen miles long. Interstate 474 also has value as a way to cross the large Illinois River, whose largeness causes it to have relatively few bridges crossing it. Interstate 474's northern end continues north as a freeway labeled as Illinois 6, which wraps around the northwest side of Peoria to end at Illinois 29. You can read more about Illinois 6 here.
When devising the mile numbering system for Interstate 474, it was imagined as an east-west highway, since it's an alternative to an east-west highway. Therefore, the exit numbers and mileage numbers start in the northwest and increase toward the southeast.
Exit 0B allows traffic to continue west onto Interstate 74, toward Moline-Rock Island; the continuation of the freeway northward leads to Illinois 6, which brings travelers toward Chillicothe:
Exit 3A leads to a spur westward, that may someday become the eastern end of Illinois 336, or a road necessitating an "Exit 3B". For now, it connects to Maxwell Road, which is a link to Illinois 116 and, by extension, Farmington:
Exit 5 is a fountain interchange to Airport Road, another way to access Illinois 116 indirectly:
Exit 6 leads to Adams Street, which leads US Route 24 west into Bartonville-- US Route 24 comes from the west and joins Interstate 474 east here:
Interstate 474 reaches its southeastern end, continuing onto Interstate 74 eastward toward Indianapolis, but an "Exit 15" is signed, pointing to a ramp off to the left for Interstate 74 west to Peoria: