I would prefer giving it a name, not a number. That's just my opinion. The issue with metro easters , is that we never had a highway 40. We always had an interstate 64, and when we drive to work or play in STL or Clayton, we stay on the same freeway most of the way. To call it 64 one second, and then 40 the next, is just too confusing.
My issue with using 40 is that it #1, appears like people in STL were unable to accept change- the conversion of 40 to a National Interstate- and the other is regionalism, leaving the Metro East out of the game, and confusing the hell out of them. This whole, "the Metro East is like another country" garbage, is annoying. We obviously can't call our portion "Highway 40," because it never was, and it goes all the way to Virginia, as I-64. Some on the East Side may want to, but... no, actually, I can't think of many who would want to.
The point is...
I don't know, but there are a few things about St. Louis that sometimes appear small-townish, and most of them are just Missouri things. The , "what high school did you go to?," and , " The Highway 40" issue, are the biggest trademarks, neither of which I was ever a part of, being that I'm from the Metro East Badlands. Sure, I'll attempt to play along, but it all kind of ends when people give me the confused , " I never heard of your school," look.
Illinois is included in some of STL culture, ok, don't get me wrong. Quite a few people, especially in parts of western Fairview Heights, and Caseyville, for whatever reason, have really strong St Louis accents. Most people call "expressways," "highways, " like many St Louisans. I don't. I call them "freeways." Most people don't honk their car horns, because it's considered rude. However, I do, because I can't stand grandma drivers.
Anyway, I agree with Jive on so many things; liberalism, socialism, multiculturalism, gritism, photography , and all that great stuff, but this is one of those rarities when I disagree, only because I feel like an outsider... unwilling to play along with the whole farty thing.

Feel sorry for me folks. Feel sorry. Look at me, Im swimming in tears here. Check it out. Just look... seriously... swimming in my tears.