IL: I-94 MP 51

[yakra]

Chicago does just fine at I-94 MP 51 at the Jane Byrne Interchange (exits 51 A-J).

Should we, uhh... aw jeez...

[Duke87]

Add points for 51B, C, E, and F? I would say yes, seems rather arbitrary to exclude them and include only A, D, G, and H.

This can be done tidily, there is a 1:1 relationship between letter suffix and destination cross street.

[Highway63]

I am pretty sure these points date back to the original creation of the CHM system, and intended to space out rather than have a point at every cross street. I'll look into this - I'm guessing it will be a pretty length process.

(I'm sorry, it's been a very busy month, and it looks like I have a backlog of things to attack next week.)

[Highway63]

I effectively "drove" the length of downtown I-94 on Google Maps, and dare I say, it probably took less time than actually driving it. 

Each point has been placed at the street of the exit, not the exit point, because otherwise I wouldn't be able to keep anything straight.

EB/SB: 51B Randolph, 51C Washington, 51D Madison, 51E Monroe, 51F Adams, 51G Jackson all get their own points.
Exit 51H (I-290) also takes care of 51I (Congress Pkwy) at the Circle Interchange. 51H-I-J share a ramp for a bit before further forking.
Exit 52A does not exist in either direction now. I've split it into 51J (Taylor, as signed on EB 94, although the departure from the mainline starts way back at Van Buren) and 52B (Roosevelt, as signed on WB 94 only). Exit 52C (EB) stays at 18th Street. The old 52A name, which is in use, stays with the Roosevelt exit.

[Markkos1992]

https://github.com/TravelMapping/HighwayData/pull/5318