Route that ends at another route with a consecutive number

[Jordanes]

Not consecutive, but interesting...

PA-118. On its eastern end is PA-415, and on its western end is PA-405.

This is one of the first state highways I ever traveled on, so it holds a special place in my heart. 

[paulthemapguy]

Probably fairly common among clustered state routes. Off the top of my head, VA 2 ends at US 1 at one and VA 3 Business at the other.

Illinois has clusters of similar numbers according to how they were established around a century ago, similar to what Takumi said.  All numbers 140-163 are in the far southern portion of the state, and numbers 90-111 (except 102) are in west-central Illinois.

• IL-147's ends are at IL-145 and IL-146.
• IL-153 ends at IL-154.
• IL-124 ends at IL-125. 
• IL-132 ends at IL-131. 
• IL-18 ends at IL-17. 
• IL-7 ends at US6 on a complete fluke.
• IL-32 ends along a multiplex with IL-33.

[Flint1979]

M-15 starts at US-24 and ends at M-25, there is a M-24 in Michigan so I don't know if a US highway would count.
M-47 ends at M-46.

[DJDBVT]

VT 3 ends at US 4 (Business)
VT 8 ends at VT 9
VT 16 ends at VT 15
VT 31 ends at VT 30
VT 73 ends at VT 74
VT 101 ends at VT 100
VT 104 ends at VT 105

[ftballfan]

M-15 starts at US-24 and ends at M-25, there is a M-24 in Michigan so I don't know if a US highway would count.
M-47 ends at M-46.

Also, the aforementioned M-24 ends at M-25 and M-32 used to end at US-31

[NWI_Irish96]

Eastern segment of IN 8 ends at IN 9
IN 59 ends at IN 58
IN 65 ends at IN 66
IN 68 ends at IN 69

[adventurernumber1]

There are some of these in southeastern Tennessee:

* TN 320 ends at TN 321 in East Brainerd (Chattanooga Metro Area).

* US 74, in its well-known and adequately signed state, ends at I-75 in Cleveland, but in reality, US 74 actually has a hidden concurrency with I-75 all the way to the I-24 interchange in Chattanooga.


Then there is also:

* GA SR 74 ends at I-75 in Macon, Georgia.

* Interstate 16 almost ends at US 17 in Savannah, Georgia, but not quite (it ends at Montgomery Street, which is just past it).





I cannot think of any others in my area at this very moment.

[hotdogPi]

US 19 at US 20

[Eth]

The only one in the Atlanta area that comes to mind is GA 236 ending at GA 237.

FL 21 and CR 21 end at FL 20. (Presumably they were once a single route that ran concurrently with 20.)

One segment of FL 40 ends at US 41, as does CR 40 farther south (same scenario).

[Flint1979]

M-15 starts at US-24 and ends at M-25, there is a M-24 in Michigan so I don't know if a US highway would count.
M-47 ends at M-46.

Also, the aforementioned M-24 ends at M-25 and M-32 used to end at US-31

Good pickup. I wasn't thinking of that when I was posting originally. There isn't any other situation like this in Michigan that I can think of.

[bassoon1986]

Louisiana probably has a large amount. Routes tend to be semi-clustered, especially in the higher LA-x00's. Here's the few I found:

362 ends at 361
379 ends at 378
384 ends at 385
414 ends at 413 on both ends
416 ends at 415
417 ends at 418, and 418's other end is at 417
569 ends at 568
570 ends at 569
694 ends at 693
746 ends at 745
751 ends at 752
764 ends at 765
908 ends at 907
944 ends at 943
989-1 ends at 988
994 ends at 993
1164 ends at 1163
1182 ends at 1181 on both ends

there's a ton more. You could literally zoom in on any parish of Louisiana and find these

[TheStranger]

California examples (beyond the already mentioned Route 7 at I-8)


Route 2 ended at Route 1 in Santa Monica (disregarding all the relinquishment technicalities one can think of); from 1934-1936 Route 1 in this area was Route 3. (From 1936 to 1964 it was Alternate US 101 though)

Although the former Route 31 was primarily defined along today's I-15 between Route 91 in Corona and the I-15/I-215 junction in Devore, I wonder if the actual Milliken Avenue routing of signed Route 31 ever ended at now-former Route 30.

Unsigned Route 51 (Business 80) ends at US 50 in Sacramento

Not an example, but almost was one: Route 71's current terminus in San Dimas is at I-10, the former US 70.

Route 79 once ended at then-US 80 (now I-8)

Route 90's eastern terminus is at Route 91

Did Route 98 ever once terminate at US 99 in Calexico?

[US 89]

Are there any more examples of routes that end at both consecutive numbers, like UT 90 at US 89 and 91?
Or a route that begins at one of its consecutive numbers and ends at the other?

[roadfro]

Current examples from Nevada:
*SR 120 ends at SR 119 in Fallon
*SR 158 ends at SR 157 at Mount Charleston
*SR 159 ends at SR 160 between Las Vegas and Pahrump
*SR 207 ends at SR 206 near Gardnerville
*SR 226 ends at SR 225 north of Elko
*SR 305 ends at SR 304 in Battle Mountain
*SR 322 ends at SR 321 in Pioche
*SR 340 ends at SR 339 near Yerington
*SR 342 ends at SR 341 in Virginia City, and also has its other end at SR 341 near Silver City
*SR 377 ends at SR 376 near Manhattan
*SR 397 ends at SR 398 in Lovelock
*SR 399 ends at SR 398 in Lovelock
*SR 446 has one end at SR 445 (at Pyramid Lake) and the other end at SR 447 (in Nixon)
*SR 488 ends at SR 487 in Baker
*SR 824 ends at SR 823 near Smith, and SR 825 ends at SR 824 near Smith

Former examples in Nevada (post-1976 renumbering):
*SR 429 ended at hidden SR 430 (then US 395) in Washoe Valley, and SR 431 also ended at hidden SR 430/US 395 in south Reno. With the completion of I-580, SR 429 and SR 430 were both combined into US 395A.
*Hidden SR 530 (William St/US 50) ended at hidden SR 529 (Carson St/US 395) in Carson City. Following completion of earlier phases of Carson City Freeway, SR 530 was eliminated and SR 529 was shortened.
*SR 650 transitioned to SR 651 in Reno at the US 395 interchange. Both routes were absorbed into SR 659 when NDOT retook control of the entire McCarran Blvd loop.
*Had SR 140 become SR 291 during the 1976 renumbering as originally planned, then SR 292 would've ended at SR 291.


I actually thought, given the clustering scheme of post-1976 routes, there'd actually be more examples...

[hotdogPi]

I have a database of all numbered routes in New England. This should be a complete list:

RI 2 at US 1 (both ends)
CT 3 at CT 2
RI 3 at RI 2
VT 3 at US 4 Business
MA 4 at MA 3A
VT 8 at VT 9
MA 8A at MA 9
MA 13 at MA 12
VT 16 at VT 15
MA 21 at US 20
NH 27 at NH 28
VT 31 at VT 30
CT 31 at CT 32
CT 70 at CT 71
VT 73 at VT 74
VT 101 at VT 100
(NH 102 at NH 101; end is ambiguous)
VT 104 at VT 105

MA 105 at MA 106
VT 109 at VT 108
CT 110 at CT 111
NH 112 at NH 113
RI 115 at RI 116
RI 116 at RI 117
NH 117 at NH 116
ME 118 at ME 117
MA 127 at MA 128
ME 128 at ME 127
ME 129 at ME 130
ME 130 at ME 129
MA 139 at MA 138
CT 153 at CT 154
ME 162 at ME 161
ME 169 at ME 170
ME 170 at ME 169
ME 175 at ME 176
ME 176 at ME 175
ME 177 at ME 176
ME 179 at ME 180
ME 180 at ME 179
ME 181 at ME 180
CT 182 at CT 183
CT 182A at CT 183
CT 191 at CT 190

[Buck87]

OH 44 at OH 43
OH 117 at OH 118
OH 128 at OH 129
OH 133 at OH 132
OH 135 at OH 134
OH 137 at OH 136
OH 152 at OH 151
OH 201 at OH 202
OH 218 at OH 217
OH 274 at OH 273
OH 365 at OH 366
OH 799 at OH 800

[roadman65]

I think OH beats out MA Lol!

This is interesting to see how well the route numbering concept is for many state route designations though.  It gives us an insight to how numbers might of been conceived in some areas.

Florida where I live has a grid system, though not perfect, but you have many set that are consecutive but do not even touch at either end.  FL 435 and FL 436 are miles apart.  FL 407 and FL 408 are in separate counties.

FL 405 and FL 406 do come close, but not close enough as both are in Titusville city limits.
FL 527 and FL 528 come close in Pine Castle and over 43 years ago actually fit this criteria as FL 527 did end at its next number up at Orange and McCoy.
FL 526 and FL 527 did meet in downtown but no terminuses for either. 

Anyway, its so great to see that this ended up to be so common.

[mrcmc888]

Delaware has only two, with a couple near misses.

DE-8 ends at DE-9 in Little Creek.  DE-10 comes a couple miles short of doing the same thing.

DE-15 ends at DE-14 west of Milford.

DE-299 ends at US-301, just off by one.

Both DE-12 and DE-14 cross US-13, but don't end there.  They both end at DE-1.

[Sam]

A couple of reverses: NY 266 ends at NY 265, and NY 325 ends at NY 324.

[roadman65]

I believe if you want reverse, NJ 36 counts in Keyport, NJ.  It terminates at NJ 35.  Years ago it even had both ends at  NJ 35 as the Eatontown Spur was not officially designated as part of Route 36 so it ended at the now defunct Eatontown Circle where Route 35 passes through.