By 1921, the whole stretch from Chicago to Belvidere was called the Grant Highway with colors top to bottom yellow, black, yellow on signage. The route from Belvidere to Dubuque was also called the Dubuque-Chicago Trail and signage was a "C" over red and white stripes.
In 1921 from Garden Prairie to west of Rockford was hard or oiled and mostly dirt west from Freeport to Dubuque.
The Il-120 stretch was oiled or hard surface from Waukegan to Volo. Small stretches were oiled or hard around McHenry, and a short stretch east and west of Woodstock.
I sure love old road maps to see how our highways came to be. Thanks to the state of Illinois for making these available.
Very Interesting. --RoadDog
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