^Westbound trailblazer leaving the Illinois 40 interchange. September 2023.

Though the route numbered "6" encountered the most in Illinois is US Route 6, Illinois also has a state route numbered "6" in the Peoria area.  Illinois Route 6 runs circumferentially around the northwest side of Peoria, serving as a northern extension of Interstate 474.  It is a freeway for its entire length, except for the future trumpet spur directing all traffic to Illinois 29 at the northern end.

From north to south, Illinois 6 gets its start as the trumpet spur from Illinois 29, dumping all traffic onto the freeway right next to Mossville:

Here's a picture in the opposite direction, where Illinois 6's freeway reaches its northern end, dumping all traffic onto the spur to Illinois 29:

Illinois 6 heads mainly west to the next interchange, with Illinois 40 on the north side of Peoria:

The next interchange after that isn't to any state road, but it provides access to Allen Road and Alta, Illinois:

After that, Illinois 6 turns more southerly, and it meets an interchange with US Route 150, just east of the southern end of Illinois 91:

A fully directional interchange with Interstate 74 marks the point where Illinois 6 ends, giving rise to the northwestern beginning of Interstate 474:

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