From the July 25, 2015, MidWeek (DeKalb, Il.) "Looking Back. News from 100 years ago.
The poorest main-traveled road reaching Sycamore is the road known as the State road which crosses Mayfield near the center and South Grove Township through the northern portion. That portion of this road for about three miles from Sycamore to Five Points has been macadamized and is in fine condition, but the remainder, which reaches a territory with which Sycamore has much business, needs prompt attention.
I believe this road is today's Il-23 and the area Sycamore did much business with was probably DeKalb.