I could swear that when my family traveled across the US from Virginia to Nevada, that at some point in a major metro area in Missouri we started getting some bizarre highway exit lettering schemes. I mean things like “Exit 21G”, for example.
Usually you don’t see letters higher than C, and most of the time it’s no higher than B.
What’s the highest-lettered highway exit in the United States, and can you show me a picture of the sign?
Don’t know if it’s the highest, but the exits into the Loop in Chicago go up to I
In Missouri the county highways are designated by single and double letters. This is most obvious in the semi-rural or fully rural parts where any significant road is a county road. But some of the thoroughfares even in urban areas have county letter designations as well.
When I lived near the edge of St. Louis suburbia Highway K, Highway N, Highway Z and Highway DD were a part of my weekly driving.
These signs are generally white/light gray squares with black letter(s) and black edge. So shaped a lot like the default user avatars here on Discourse, but in inverse video; dark letters on a light background. So an inverse video version of this:
https://avatars.discourse-cdn.com/v4/letter/t/000000/50.png
See also
https://www.google.com/search?q=Missouri+county+highway+signs&tbm=isch
In MO exits off the interstate are numbered by the nearest milepost. And if multiple exits are needed, they’re lettered A, B, or C. I cannot recall anywhere in St. Louis, even in the dense urban with exits close together any C or higher letters. And most A/B combos were things like cloverleafs, where A was the first turnoff before the overpass going one way, and B was the turnoff after the overpassgoing the other way on the same crossing road. It was vanishingly rare that A and B exits led to different roads.
I can’t vouch for every exit in Kansas City, which is the only other “major metro” area in MO.
But I’m going to bet you saw Exit 21 leading to Highway G, rather than Exit 21G
In downtown LA, the start of the 101 freeway coincides with a crisscrossing of I-5, I-10, the Pomona freeway (SR 60), and a number of important surface streets. Exits 1A through 1E are there (street view link).
Not too far from there, the 110 freeway passes over the 101, by Dodger stadium, and over a couple of big surface streets. This leads to having exits 24A through 24D (street view link).
You’re probably thinking of the fittingly named alphabet loop in Kansas City, Missouri. Exit 2A to exit 2Y are represented (except I and O which are too easy to confuse with the numbers 1 and 0), but they’re not all on the same numbered highway.
Cool. I (obviously) did not know that.
I’ve driven to & through KC a few times, but never noticed the alphabet loop as such.
I-170 in St. Louis (aka, The Innerbelt) goes up to Exit 1F
I missed this part last night. Here’s a sign for Exits 2X and 2Y on I-35 in Kansas City:
