This site is owned, written and copyrighted by Rich Carlson. I have no connection to IDOT, ITHA or AASHTO.

Everything about US-66 in Illinois


Business US Routes in Illinois


Want to talk about Roads and Roadtrips? Do it here!


All about the Tollways in Illinois



Illinois Department of Transportation's Web Site. (The Offical State Highways Site!)


The Illinois State Toll Highway Authority Web Site

I have moved all my scanner and frequency information to the CARMA Profiles Page at

The Chicago Area Radio Monitoring Association is the Largest Scanner Club in the USA. See why here!

Useless but interesting trivia about the Illinois Highway System.

I am not the only one who does this stuff!

Before the had numbers roads were Trails and they were posted with special signs.

All abut Counties in Illinois and the rest of the country.

Who I am. What I do. Why I do it.


A comprehensive look at the history and evolution of the Illinois Numbered Highway System


IL-390 Introduced October 29, 2013


New (August 2010): Chicago-Kansas City Expressway Designation!


Read about the "CKC IL-110" markers on the I-88 EW Tollway!


Ever wonder why the road in your town is numbered what it is?

Whatever happened to Route 66 (or 42 or 116A...)

Why is I-94 posted as East-West When it runs North-South?

What's the difference between a US Route, an Interstate and a State Route?

How come the road out there has 2 different numbers on it?

If you ever asked questions like these, read on and get the answers.

Read all about your favorite route:

Route overview and markers

Routes 1 thru 20

Routes 21 thru 40

Routes 41 thru 60

Routes 61 thru 80

Routes 81 thru 100

Routes 101 thru 120

Routes 121 thru 140

Routes 141 thru 160

Routes 161 thru 180

Routes 181 thru 200

Routes 200 and up


Did you find an error on my site? Want more information?

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Rexie's cute little Corner of the Web (Art's & Crafts etc.)

My wife has a life and a web site too. See What she does with it.

LMCT marker courtesy Christopher Bessert, used by permission

Updated: 10-29-2013