Consecutive highway concurrency/intersection

[NE2]

For the opposite direction (back to Leverett Circle again), one could've placed a TO prefix for MA 28; but since there's no direction cardinals displayed, such is not needed in this case.

That would be just as silly. The ramp ends and you're at 129 or 28.

[hotdogPi]

Concurrencies:

NH 107/108
MA 110/111
MA 2/US 3

Termini:

MA 13 ends at MA 12
NH 27 ends at NH 28
NH 102 ends at NH 101 (+/- 0.5 miles, 102's end is a bit ambiguous)

[english si]

Here's Great Britain: only doing concurrencies, and with route numbers under 100, to limit it.

A10-M11 (around Cambridge)
A11-A12 (Bow - Redbridge, unless you don't treat the A11 as something continuous anymore)
A26-A27 (Lewes)
A33-A34 (Winchester - note it's a 'useless' concurrency)
A38-A39 (Bridgwater)
M40-A41 (Bicester - M42, unless you don't treat the A41 as continuous anymore)
A41-M42 (Solihull, unless you don't treat the A41 as continuous anymore)
A45-A46 (Coventry)
A52-A53 (Stoke)
A66-A67 (Darlington)
A68-A69 (Corbridge)
M90-A91 (Milnathort)
A95-A96 (Keith)
A96-A97 (Huntley)
A97-A98 (Banff)

[US81]

I'm curious as to how many Louisiana has that intersect. I'll post it later when I compile it.

I immediately thought of US 79/US 80, of course.

[bulldog1979]

Michigan's list

• the M-24 and M-25 intersection in Unionville
• the M-32/M-33 concurrency near Atlanta
• the M-46 and M-47 intersection near Hemlock
• the M-139 and M-140 intersection near Niles
• the I-696 and M-1 interchange (if we can wrap from the end back to the beginning)

Not too long ago, we had M-553 and it's unsigned sibling, M-554.

[thenetwork]

These will work. I was also thinking along the lines of I 70/71 in Columbus Ohio or US 79/80 in Shreveport Louisiana

I'll see your US 79/80 and raise you an I-79/80 in Mercer, PA

[formulanone]

Florida does its best to avoid overlapping consecutive numbers on concurrencies, due  to The Grid layout for numbers up 1 through 99; even and odd numbers tend to be placed in differing regions of the state. Once you delve to the three-digit state road numbers, where they are packed and clustered together in cities, there's many intersections with consecutive numbers, but still, few multiplexes (except when twinned/tripled with US Routes).

FL 16 overlaps US 17 for about a mile in Green Cove Springs.

[tidecat]

AL 215 & AL 216, Tuscaloosa
I-64 & I-65, Louisville
US 64 & I-65, Tennessee

[Charles2]

AL 48 & AL 49 in Lineville
AL 49 & AL 50 west of Camp Hill
AL 77 & US 78 in Lincoln
US 80 & AL 81 in Tuskegee
US 43 & AL 44 in Guin
AL 83 & US 84 in Evergreen
I-20 & AL 21 in Oxford
AL 17 & AL 18 in Vernon

[hbelkins]

We can come up with two consecutive number intersections until the cows come home.

[NE2]

We can come up with two consecutive number intersections until the cows come home.

Unfortunately an intersection of M and OO isn't consecutive. But what about P/OO?

[cwf1701]

Michigan's list

• the M-24 and M-25 intersection in Unionville
• the M-32/M-33 concurrency near Atlanta
• the M-46 and M-47 intersection near Hemlock
• the M-139 and M-140 intersection near Niles
• the I-696 and M-1 interchange (if we can wrap from the end back to the beginning)

Not too long ago, we had M-553 and it's unsigned sibling, M-554.

and lets not forget the historic US-24/US-25 Concurrency in Southern Wayne/Northern Monroe County (eliminated when US-25 was Decommissioned).

[SignGeek101]

I got a few.

ON 400 - ON 401
ON 401 - ON 402
ON 3 - ON 4
ON 402 - ON 403
ON 416 - ON 417
MB 2 - MB 3
ON COUNTY 6 - COUNTY 7
ON 11 - ON 12
SK 3 - SK 4
YK 1 - YK 2

I could go on and on...

[hbelkins]

Since everyone seems insistent on posting very common two-route concurrencies or intersections, can anyone go for higher numbers than this?

[NE2]

Since everyone seems insistent on posting very common two-route concurrencies or intersections, can anyone go for higher numbers than this?

First one I found.

[Darkchylde]

I-70 and US 71 for a brief distance in KCMO as part of the downtown loop.

Just to the west in KCK, US 69 has a different brief concurrency with I-70, between MM 420 and 422.

[bugo]

US 270/271, the highest numbered US highway duplex in the country.

[PHLBOS]

MA 8 & MA 9 between Dalton & Pittsfield and US 3 & MA 2 through Cambridge and touching Watertown.

[SD Mapman]

US 14 and SD 13 near Elkton, I-29 and SD 28, SD 44 and 45 in Platte, SD 19 and US 18, aaaaand that's about it for SD.
(SD 37 and 38 almost touch)

[jwolfer]

Florida does its best to avoid overlapping consecutive numbers on concurrencies, due  to The Grid layout for numbers up 1 through 99; even and odd numbers tend to be placed in differing regions of the state. Once you delve to the three-digit state road numbers, where they are packed and clustered together in cities, there's many intersections with consecutive numbers, but still, few multiplexes (except when twinned/tripled with US Routes).

FL 16 overlaps US 17 for about a mile in Green Cove Springs.

US 17 is secret SR 15. So a trifecta

[BloonsTDFan360]

The only ones for Oregon that I could think off the top off my head are:

OR 206/OR 207
OR 334/OR 335 (both are unsigned highways)

[PHLBOS]

That would be just as silly. The ramp ends and you're at 129 or 28.

FWIW, such didn't stop MassDPW/Highway/DOT from still signing Exit 15A (old Exit 60N) off I-95 (US 1 & MA 128) as TO 1A rather than just 1A despite the fact since 1989-90; that short stretch of Boston-Providence Turnpike between the cloverleaf and Elm St. is indeed considered (but not fully signed) as MA 1A.

The reasoning for not placing the word SOUTH on those exit signs are obvious.  Having both directions on a cloverleaf signed as SOUTH with nothing else can be confusing to those unfamiliar with the route in question.  But the TO tags in front of the MA 1A shields should've went when US 1 was rerouted.

[jdb1234]

AL 48 & AL 49 in Lineville
AL 49 & AL 50 west of Camp Hill
AL 77 & US 78 in Lincoln
US 80 & AL 81 in Tuskegee
US 43 & AL 44 in Guin
AL 83 & US 84 in Evergreen
I-20 & AL 21 in Oxford
AL 17 & AL 18 in Vernon

Also:

AL 21 & AL 22 in Rockford

[formulanone]

US 17 is secret SR 15. So a trifecta

...good catch!

Found a photo - there's no FL 15 easter egg, though.

[NE2]

Getting silly... the distance sign in the background has 13 and 28 (twice 14). And 45 is thrice 15. And the license plate is a secret code that means there's a FEMA camp 18 miles ahead on the left.