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[OCGuy81]

Noticed while recently driving I-205 in Vancouver, WA that on northbound 205, there is one exit ramp at the Mill Plain Blvd exit that serves three lettered exits. 28A is Mill Plain eastbound, 28B is Mill Plain westbound, and 28C is 112th Ave.  All three are served by one ramp off of 205.

This seems unique, but I'm sure there's other places similar?

[Ben114]

There's a few of them in MA:
I-95 exits 19B-C
I-95 exits 32A-B
I-495 exits 35A-B-C, which splits off for exits 35B-C
I-495 exits 45B-A
US 3 exits 30B-A (along with 31)
I-90 exits 134A-B-C (back when it was 24A-B-C)

And in RI:
I-95 exits 22C-B-A
I-295 exits 9A-B-C (back when it was 6A-B-C)
I-195 exits 1B-C
RI 146 exits 8A-B-C

[SkyPesos]

These are pretty common for cloverleaf interchanges with C/D lanes
Here are some examples I can think of, though not all linked are with C/D lanes
Exits 43 A-B and 41: I-270 to I-70/US 40
Exits 63 A-B: I-275 to OH 32
Exits 31 A-B: I-64 to I-170/Brentwood/Hanley
Exits 235A-B: I-70 to US 67

No suffixes, but here's one exit with two unconsecutive exit numbers exiting off the same ramp: Exits 33 and 30: I-270 to Easton/OH 161

[Great Lakes Roads]

Here are a few in Indiana
I-465 SB Exit 16A-B (US 136 West- Crawfordville Road/I-74 West- Peoria)
https://www.google.com/maps/@39.8119537,-86.2757209,3a,75y,176.65h,90t/data=!3m6!1e1!3m4!1so2mFVvIloVxADMG7KQ84Fw!2e0!7i16384!8i8192

I-465 SB Exit 9A-B (I-70- St. Louis/Indianapolis International Airport/Indianapolis)
https://www.google.com/maps/@39.7208133,-86.264774,3a,75y,179.41h,95.11t/data=!3m6!1e1!3m4!1sSJSlA5IuzLYExcdnlQqLwg!2e0!7i16384!8i8192

I-70 Exit 11A-B in Terre Haute
https://www.google.com/maps/@39.4307519,-87.3178432,3a,75y,265.43h,90t/data=!3m6!1e1!3m4!1se_wKw0bmRbg2ecNZR271Pw!2e0!7i16384!8i8192
https://www.google.com/maps/@39.4306251,-87.3461863,3a,75y,93.3h,90t/data=!3m6!1e1!3m4!1s22RG22x6hAlmm5q6PZuVOQ!2e0!7i16384!8i8192

I-80/94 EB Exits 12-13 (I-65 North- To Toll Road and Central Avenue)
https://www.google.com/maps/@41.5678334,-87.306788,3a,75y,75.12h,90t/data=!3m6!1e1!3m4!1s8gsfdjsW9LFMJpyMTv2xEw!2e0!7i16384!8i8192

[US 89]

It appears the majority of lettered exits in Utah come from the same ramp:

I-15 exit 257, north (257A-B) and south (257B-A)
I-15 exit 298, south (298B-A) - northbound is still just 298, but there's a bunch of construction there now so I'm expecting a renumbering once the final signage goes up
I-15 exit 305, north (305A-D) and south (305C-A)
I-80 exit 115, east (115A-C) - westbound has separate ramps
I-80 exit 123, west (123B-A) - no eastbound exits
SR 201 exit 15, west (15C-B) - eastbound has separate ramps

[jeffandnicole]

NJ's I-295 Exit 2B-C: https://goo.gl/maps/m1YkSHuWQSJ4d7L76 . This one is unusual because the B/C split is just an ordinary porkchop split at the top of the ramp: https://goo.gl/maps/Wn8yhicgnfijbYvR9 , which was probably done just to match the different ramps on I-295 South at this interchange.  And maybe even more unusual...the route you're actually exiting onto, NJ 140, is never referenced on any sign.

More standard: Exit 45 A/B: https://goo.gl/maps/17uYMJBc42WdbSdz6

[TheHighwayMan394]

MN I-94 exit 207 A&B MN 101/County 81 and MN 101 North ramp
MN I-94 exit 35 B&C (using I-694 exit numbers) MN 252 and East River Road, which just directs you to a ramp back onto 694 to access those exits
WI I-39/90/94 exit 135 A-B-C US 151 North/South and High Crossing Drive (High Crossing Drive exit westbound only)

[Great Lakes Roads]

So many on the Illinois Tollway system!

I-80/I-294/I-94 (Tri-State Tollway)

Exit 2A-B on I-80/I-294
Exit 6A-B
Exit 12A-B (SB)
Exit 38B-A (SB)
Exit 8B-A (NB) on I-94

I-355 (Veterans Memorial Tollway)
Exits 22-20 (SB)

I-90 (Jame Addams Memorial Tollway)
Exit 68A-B

IDOT

I-55
Exit 279B-A (SB)
Exits 165-164 (SB)
Exit 157A-B (NB)
Exits 92A-B

I-57
Exit 346A-B
Exit 348A-B

I-72 (133A-B)

Oh, and there might be some at the Circle Interchange, particularly when construction gets done (51F-I-52A S/E and 51D-A N/W?)...

[roadman65]

NJ's I-295 Exit 2B-C: https://goo.gl/maps/m1YkSHuWQSJ4d7L76 . This one is unusual because the B/C split is just an ordinary porkchop split at the top of the ramp: https://goo.gl/maps/Wn8yhicgnfijbYvR9 , which was probably done just to match the different ramps on I-295 South at this interchange.  And maybe even more unusual...the route you're actually exiting onto, NJ 140, is never referenced on any sign.

More standard: Exit 45 A/B: https://goo.gl/maps/17uYMJBc42WdbSdz6

The NJ one has it because SB has two ramps serving the same place as the NB one along with there being a 2A at the u turn ramp back to I-295 just before it creates the awkward situation.

The EB I-4 ramp to Michigan Street in Orlando use to be 81B-C before the I-4 Ultimate. That too had a WB Exit 81A with two WB Michigan ramps to create the same exact situation.

[Tom958]

Per the MUTCD, states decide their own policy with regard to numbering exits on ramp splits and CD roads. My own state of Georgia doesn't, but obviously many other states do.

[Brandon]

Oh, and there might be some at the Circle Interchange, particularly when construction gets done (51F-I-52A S/E and 51D-A N/W?)...

Once complete, there will be 51H (I-290 - Aurora), 51I (Congress Pkwy/Ida B. Wells Dr), and 51J (Taylor St/Roosevelt Rd) heading southbound (eastbound) on I-90/94.

[OCGuy81]

Great examples. I wasn’t aware this occurred as much as I’m seeing!

[wanderer2575]

Probably pretty common with collector/distributor carriageways.  Here's one for both multiple letters and multiple numbers:

https://goo.gl/maps/wWGJuQg9BtPZZ9LW6

[CardInLex]

Per the MUTCD, states decide their own policy with regard to numbering exits on ramp splits and CD roads. My own state of Georgia doesn't, but obviously many other states do.

The new draft of the MUTCD lays out clear examples on how CD ramps are to be numbered and signed. This is needed as they currently differ from state to state (or even interchange to interchange).

[machias]

US 12 NB in Wisconsin, EXITS 330 A-B is one ramp for the entire interchange.

[DJ Particle]

MN I-94 exit 207 A&B MN 101/County 81 and MN 101 North ramp
MN I-94 exit 35 B&C (using I-694 exit numbers) MN 252 and East River Road, which just directs you to a ramp back onto 694 to access those exits
WI I-39/90/94 exit 135 A-B-C US 151 North/South and High Crossing Drive (High Crossing Drive exit westbound only)

Northbound I-35E - Exit 101 A-B (MN-62) is the same ramp
https://www.google.com/maps/@44.8834535,-93.1387133,3a,75y,39.76h,91.66t/data=!3m6!1e1!3m4!1sOqp4b3dFUO4S7lKh8Osr4w!2e0!7i16384!8i8192

[debragga]

I-20 East in Monroe, LA, exits 118 A-B
https://www.google.com/maps/@32.4996441,-92.0893018,3a,75y,102.53h,95.4t/data=!3m7!1e1!3m5!1s6ESLe6DS3cp8a1S9rMOGUA!2e0!6s%2F%2Fgeo2.ggpht.com%2Fcbk%3Fpanoid%3D6ESLe6DS3cp8a1S9rMOGUA%26output%3Dthumbnail%26cb_client%3Dmaps_sv.tactile.gps%26thumb%3D2%26w%3D203%26h%3D100%26yaw%3D237.91017%26pitch%3D0%26thumbfov%3D100!7i13312!8i6656

[Crown Victoria]

Interstate 81 in Christiansburg, VA:

https://www.google.com/maps/@37.1250791,-80.3810102,3a,75y,74.01h,90t/data=!3m6!1e1!3m4!1sE2Y578cwxFLfHAliqY3poQ!2e0!7i16384!8i8192?hl=en

[Mapmikey]

Here is what I assume is a rarer variation:

Here is I-695 inner loop at MD 147 - https://goo.gl/maps/WjywYyDvgvjYzD6Z7

This ramp does not have any other ramps but has this posting - https://goo.gl/maps/7VAKsMGpDBuJYSgF9

What happened here is that there used to be a clover ramp for Exit 31B, while the ramp that remains only headed south on MD 147.  Now there is a stoplight at the top of the ramp to go either direction on MD 147.

[Rothman]

I-81 SB at NY 298 / Bear Rd / Hiawatha in Syracuse.

[jmacswimmer]

Here is what I assume is a rarer variation:

Here is I-695 inner loop at MD 147 - https://goo.gl/maps/WjywYyDvgvjYzD6Z7

This ramp does not have any other ramps but has this posting - https://goo.gl/maps/7VAKsMGpDBuJYSgF9

What happened here is that there used to be a clover ramp for Exit 31B, while the ramp that remains only headed south on MD 147.  Now there is a stoplight at the top of the ramp to go either direction on MD 147.

Another example from the same highway: I-695 Outer Loop exits 12 C-B (and similar signs along the ramp, although the MD 372 west marker was replaced at some point without the 12C tab on top).

[GaryV]

I wish I could remember where it was, somewhere in Wisconsin I think.  The direction we were heading had only one exit ramp, and you turned left or right at the end of the ramp.  The other way had 2 exit ramps, one a normal diamond type and the other a cloverleaf ramp.  In both directions, the exits were numbered XX A and B.

[webny99]

Probably pretty common with collector/distributor carriageways.

Yeah, I find examples that aren't collector/distributor to be more interesting. Not much point in listing all those out since there's so many.

This one is interesting because while it's not technically numbered, the corresponding southbound exits (which are separate) are numbered. This is is indicative of a larger trend in my area of not numbering the split exits individually, also seen here and here.

[TheGrassGuy]

For a fake version of these, try Exit 13A-B on I-287 north in NJ.