Since I-55 is just an upgraded US 66 all the way across Illinois, it makes sense that the old alignment is never far away. I-55 NB curves west around Williamsville while Oak St. continues straight on old US 66. As a bonus, there's an original alignment of US 66 just to the east along Elm St.

I-55 mainline

I-64 and I-55/64
I-70 and I-55/70

Arsenal Rd. interchange (Exit 245)

Onto old US 66 (I-55's predecessor)

Business I-55, Springfield


Wind farm north of Normal.

Into Missouri on I-55
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