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[agentsteel53]

I would like to know if someone has any examples of this?   a route which was a given number on two sides of a state line, and then when the number was changes, both states gave it a new number, to preserve the continuity.

I cannot think of any examples offhand.  I was thinking about this when I noted that Idaho/Nevada 51 was changed to Nevada 225, but California/Nevada 28 and 88 kept their numbers, when Nevada did their renumbering in the late 1970s.

[TheStranger]

I cannot think of any examples offhand.  I was thinking about this when I noted that Idaho/Nevada 51 was changed to Nevada 225, but California/Nevada 28 and 88 kept their numbers, when Nevada did their renumbering in the late 1970s.

IIRC, California 266 is a 1964 route, while NV 266 emerged in the 1976 renumbering.  Not sure if this fits, more like a creation of a same-number-in-two-states route that didn't originally exist.

NJ/NY 284 seems to perfectly fit this description though.

[NE2]

FL/GA 23/121 is interesting. Florida numbered it 23 in the 1945 renumbering; this fit the grid and matched Georgia. Later they renumbered 23 to 121 (I've never been clear on exactly why; it could have been due to the proximity of US 23); Georgia kept 23 but also extended 121 down to the line.

[Takumi]

VA/NC 195 was changed to 186 in the 70s, when I-195 appeared in Richmond. VA changed it first, then NC changed it a couple years later.

VA/NC 168 was originally 170 on both sides. I'm not sure why the renumbering occurred, but it's just one part of the strange history of VA 168.

[US71]

AR 47 became AR 37 to match MO 37.

A section of K-57 changed to K-171 to match Missouri 171 (which ironically, was originally MO 57).

AR 99 became AR 43 to match MO 43

[kurumi]

In 1932, CT/RI 103 became CT/RI 14 (CT's change was 1/1/1932; I don't have the exact date of RI's change). Similarly, NE 32 was moved (and kept its number on both sides) across the CT/MA state line.

CT/MA 52 became I-395 in 1983 (not as dramatic an example, because "most" interstates keep their numbers from state to state :-)

And I wonder: the early number for CT 78 (which crosses into RI) was relocated Route 2. Would RI have also numbered this Route 2? RI 2 in the past seemed to have an unofficial overlap with US 1 to the state line.

[Mapmikey]

NC/SC 77 became NC/SC 177 when North Carolina wanted to renumber to accomodate I-77 (South Carolina does not worry about this with their interstate numbers)

NC/SC 85 became NC/SC 145 for the same reason


Mapmikey

[NE2]

CT/MA 52 became I-395 in 1983 (not as dramatic an example, because "most" interstates keep their numbers from state to state :-)

Is 95/276 the only one that doesn't?

[pianocello]

WI-80 used to continue into IL as IL-80, but now it's IL-84 after it was renumbered due to crossing I-80.

[roadfro]

IIRC, California 266 is a 1964 route, while NV 266 emerged in the 1976 renumbering.  Not sure if this fits, more like a creation of a same-number-in-two-states route that didn't originally exist.

Correct. Although Nevada's 266 was originally the southernmost part of SR 3 prior to 1976.

[formulanone]

FL/GA 23/121 is interesting. Florida numbered it 23 in the 1945 renumbering; this fit the grid and matched Georgia. Later they renumbered 23 to 121 (I've never been clear on exactly why; it could have been due to the proximity of US 23); Georgia kept 23 but also extended 121 down to the line.

Wasn't SR 121 supposed to be a "US Route 121", but never happened? (Can't find a decent source of it...)

[Steve]

A lot of routes on the QC/VT border had different numbers when QC still used 1/2 digit primary routes. I don't know how many had the same number in VT.

[PurdueBill]

I believe that former MA-NH 86 became 286 in both states after Mass wanted to change 86 because of I-86.  (And then I-86 became I-84 rendering it moot; now there is no route 86 of any type in Mass or NH.)

[kurumi]

I forgot about CT/MA 93 (now 169) and CT/MA 190 (now 168). Both coordinated changes were due to number conflicts with MA interstates.

[jwolfer]

FL/GA 23/121 is interesting. Florida numbered it 23 in the 1945 renumbering; this fit the grid and matched Georgia. Later they renumbered 23 to 121 (I've never been clear on exactly why; it could have been due to the proximity of US 23); Georgia kept 23 but also extended 121 down to the line.

Wasn't SR 121 supposed to be a "US Route 121", but never happened? (Can't find a decent source of it...)

Florida has reassigned SR 23 to the First Coast Outer Beltway...( A future toll road that is supposed to go from I-10 in West Jacksonville to somewhere near St Augustine on I-95.It is now a partial freeway/super 2 probably will be completed to SR 21 in Middleburg by 2014)  But Baker County still has auxiliary routes off of 121 numbered 23a-23f that I know of.  Also Alachua County maps show CR 23 near Gainesville.  Perhaps the renumber was to avaoid confusion w US 23 Florida has done this a couple times ( SR 1 is now A1A and SR 27 became SR 9336

121 goes up into SC and it would work as a US 121 but

[yakra]

NE 32 was moved (and kept its number on both sides) across the CT/MA state line.

MA/NH line as well.

And I wonder: the early number for CT 78 (which crosses into RI) was relocated Route 2. Would RI have also numbered this Route 2? RI 2 in the past seemed to have an unofficial overlap with US 1 to the state line.

Speaking of Route 2! New England 7 became NY/MA 2 when US 7 entered the picture. (NY 7 got switched to that other route heading east outta Albany.)

[The High Plains Traveler]

New Mexico changed its route 92 to 116 around 1960 when Texas renumbered its route that runs west from Lubbock to New Mexico as 116 (it had been 290). Then in the 1980s, Texas extended TX-114 west from Dallas to Lubbock and west over former 116 to New Mexico, so New Mexico renumbered 116 as 114.

Texas did not change any of its route numbers to match any roads that changed in New Mexico's 1988 renumbering. New Mexico did change one of those routes back to its original designation (176 near Eunice) a few years back.