State Routes signed like 3di

[DandyDan]

Wisconsin has WI 794, which is just an extension of I-794.

There's also Colorado's CO 470 and the E-470 toll road.

[getemngo]

Argh, DandyDan posted WI 794 as I was typing it! That's the only one in Wisconsin.

Michigan has no freeway examples at any level. M-294 connects to I-94, but it's not a freeway. Future M-231 is named after the nearby US 31 freeway and may eventually become a freeway itself.

[kurumi]

Connecticut doesn't do Indiana-style 3-digit branches for state routes -- at least geographically. But across time, as routes designations are changed, CT does (or did) this all the time. Some number changes, off the top of my head (and some of these are for portions of a route):
CT 109 -> 209
72 -> 272
72 -> 572 -> 372
72 -> 372
722 -> 222
529 -> 229
743 -> 243
854 -> 254
862 -> 262
863 -> 263
87 -> 287 (proposed, but ultimately not needed, long story)
89 -> 289
905 -> 305
909 -> 309
915 -> 315
816 -> 316
517 -> 317
418 -> 318
649 -> 349

But for the most recent unsigned to signed "promotions", they seemed to walk away from that:
611 -> 319 (not 311)
645 -> 234 (not 245)
622 -> 244 (OK, no x22's available)
750 -> 103 (not 250)

[NE2]

164 would theoretically fit, but its numbering in this particular case is coincidental.  The Hampton Roads area is where the VA 16x routes are concentrated, and there's been a VA 164 in the area dating back to the mid-1930s.

Disagree. CTB 1968-08 p. 41 lists potential expansions to the Interstate system, including what are now I-664, SR 164, and SR 288. The SR 164 designation first appears in 1969-04 p. 79. There's a very good chance it was numbered deliberately. Other nearby routes created at about the same time include 199 (1970), 239 (1968), and 249 (1970), none of which fit the clustering.

[SSOWorld]

Wisconsin has WI 794, which is just an extension of I-794.

Technically one would be correct on the WI-794, however that is not a full freeway   It was intentionally signed such due to opposition to freeway being built forced it to be built as a parkway.  The route designation extends all the way to College Ave (CTH-ZZ) though the parkway ends at Pennsylvania just a block south of Layton Ave.  This is a scaled back plan that got shot down that had the Interstate extending to Racine and Kenosha.

[Brandon]

IL-394 north of Sauk Trail.
IL-255.

[hbelkins]

Tennessee's 840.

And I think TN 381 in Johnson City should count, since it branched off the former I-181.

Also, Indiana's 265, which is an extension of I-265 and will eventually become I-265 when the bridge is finished.

NC 540, too.

[cl94]

Many of the New York cases (extensions) have already been mentioned, but I'd like to bring up a couple more. NY 531 is a freeway bypass of NY 31. NY 598 is a spur off of NY 298 connecting to NY 5. NY 404 is a former alignment of US/NY 204; similar are NY 417 (former routing of NY 17) and NY 415 (former routing of US/NY 15). In just about every case, though, New York just assigns a suffix to spur/bypass/alternate/former routings instead of putting a digit in front.

[NE2]

And I think TN 381 in Johnson City should count, since it branched off the former I-181.

Probably coincidence, but I don't have the official maps to prove it.

[Darkchylde]

I think Mississippi's 1xx loops and spurs could count here; as their US highways are upgraded and moved to bypasses, the old alignments through towns are sometimes kept on the books as 1xx highways. In most other states, these would probably be Business-bannered US highways. There are many examples, such as MS 198 a few times along US 98 east of McComb, and several MS 178s along old US 78 as 78 itself is moved onto bypasses in preparation to become I-22.

[mgk920]

Argh, DandyDan posted WI 794 as I was typing it! That's the only one in Wisconsin.

Nope, you forgot WI 441 here in the Appleton area.



Also:
-WI 110 - Before the adjacent US 45 freeway was opened on and along it between US 10 (Winchester interchange) and US(I)-41 in Oshkosh (Algoma interchange) a few years ago, WI 110 served that function between US 10 at Fremont and Oshkosh.  The other direction of WI 110 still runs northward from US 10 at Weyauwega to US 45 at Marion.  The now decommissioned Fremont-Oshkosh part of WI 110 was originally US 110 and before that, for a few years, was the final routing of the Yellowstone Trail.

-WI 241 - 27th St, ex US 41, in Milwaukee and adjacent southern Milwaukee County suburbs.  The state highway was cut back to the south and redesignated as WI 241 when the northern part of the street was downgraded and US 41 rerouted to follow nearby I-94 a few years ago.

-WI 253 (old US 53) in the Spooner area.

-WI 310 between I-43/US 10 and WI 42 in Two Rivers.  WI 310 is a straight ahead eastward extension from US 10 to the west from I-43, which turns southward on I-43 at that interchange.

-WI 341 (mostly hidden, only one sign exists, it's on a Miller Park parking lot access roadway) - Miller Park Way between I-94 (Stadium interchange) and WI 59 (National Ave) in Milwaukee.  Road is ex US 41 and until 'I-41' becomes official and signed, US 41 still exists on the Stadium Freeway north of I-94.  It may be renumbered to and signed as 'WI 175' when that new interstate designation is finalized - stay tuned.

Mike

[bing101]

What about CA-210 in the Inland Empire its a continuation of I-210.

[bing101]

Wasn't CA-480 supposed meet interstate standards from Marina District to Golden Gate but there was an I-480 from the Embarcadero to Financial District in San Francisco before being re designated as CA-480 prior to the Loma Prieta Quake.

[kkt]

Wasn't CA-480 supposed meet interstate standards from Marina District to Golden Gate but there was an I-480 from the Embarcadero to Financial District in San Francisco before being re designated as CA-480 prior to the Loma Prieta Quake.

No, originally I-480 was supposed to go from the Embarcadero to the Golden Gate as an elevated structure.  Caltrans built the Embarcadero section that existed prior to the quake, but San Francisco turned down the rest of it in the late 1950s.  The part that was built changed to CA 480 around the early 1960s, and the funds for I-480 completion were sent elsewhere. 

[swbrotha100]

In Arizona, SR 210 is supposed to eventually connect to I-10 in Tucson. If 210 was built as planned, it would have been a freeway.

In the 1980s, the current freeway system in the Phoenix area would have used mostly SR x10 and SR x17 numbers, but instead use the current SR 51, Loop 101, Loop 202 and Loop 303.

[bzakharin]

On one of the first maps of this area I've seen, NJ-90 was mistakenly signed as I-90. There are also 2 digit state routes in NJ that have 3 digit spurs like interstates would, e.g. NJ-47 has 147 and 347, NJ 29 has 129, and NJ-24 has 124

[Rover_0]

While in the planning stages someone at UDOT I conversed with mentioned possibly numbering the St. George-area Southern Parkway (SR-7) as SR-415 or SR-615, but later said it was not being planned as an Interstate-standard corridor. Also, he later said that it doesn't fit the Utah system (being high-numbered and all).

That said, I can see it eventually becoming an Interstate given enough time.

[SP Cook]

If I understand the original question correctly, WV has one example.  WV 279 branches off I-79 north of Clarksburg and, currently ends at US 50.  Second phase would be to continue from there back to I-79 south of Clarksburg, although there are no current plans to build it.  It would form something of a bypass of Clarksburg, although none is needed.

[dfwmapper]

I don't believe Texas has any, because TxDOT just doesn't work that way.

In Arizona, besides SR 210 mentioned previously, there is one that partially qualifies. SR 51 was originally planned to be numbered as either I-510 or SR 510, and they chopped off the zero. Quite a few that can be included if extended to 3dus routes. SR 189 and SR 289 are spurs of what used to be US 89. SR 195 is a spur of US 95. SR 260 is a double-sided spur of US 60. SR 266 and SR 366 are spurs of old US 666 (now US 191). SR 389 is a spur of US 89A.

[sawblade5]

I just noticed two possible candidates in the St. Louis area (SR 364 & SR 370):

http://prntscr.com/5aodp5

Yea MO-370 was supposed to become an Interstate but a dispute on the numbering with the AASHTO as MoDOT wanted it to be I-370 while AASHTO was only willing to allow it to be I-870 which was the last loop number left for I-70 in Missouri. See http://www.kurumi.com/roads/3di/i370.html for my source of info. As for extending MO-370 to US-67 Lindbergh BLVD. It would not serve the airport as you think but it is still a very great idea to give the Industral Area an Alt Route from only having to use I-270 or I-70 here, thereby relieving traffic on extremely busy highways there.

As for MO-364, even though the road is complete to I-64 the interchange is not yet up to Interstate Standards as MoDOT didn't have the money yet to complete it as such an interchange. I am sure once it gets upgraded there MoDOT will propose to the AASHTO to make it I-364. See http://www.interstate-guide.com/i-364_mo.html for sources on this. As for you exention there to US-67 Lindbergh BLVD. It is already built but can be upgraded to freeway by getting ride of the 2 grade intersections there and upgrading them to interchanges. It appears on the aerial image that there's plenty of room to do so. I bet MoDOT had this proposed as on of the projects on the Transportation Sales Tax issue that didn't pass earlier this year. (There was a  ton of Sales Tax issues on the ballot during that election and they all lost, Missouri already has one of the highest sales tax rates. see source: http://www.washingtontimes.com/news/2014/mar/20/missouri-sales-tax-rates-ranked-14th-highest/ ) But that is another topic.

Other state routes in Missouri that I am aware of are MO-249 (Maybe one day become I-249 if they build a proper freeway connector at Carthage, MO) and MO-744 (Which is a former alignment of US-66 in Springfield but is very unlikely to become I-744 due to it being just a main city street and not a freeway. Upgrading this road to a freeway would destroy some Route 66 landmarks along with losing a ton of businesses along this corridor)

[cwf1701]

For a time in the mid-70s, what would become M-5 was proposed to be M-275 in Metro Detroit.

[bulldog1979]

For a time in the mid-70s, what would become M-5 was proposed to be M-275 in Metro Detroit.

Yes, but that doesn't fit the question posed in the thread topic. The M-275 proposal was as an extension of I-275, not as its own loop or spur off I-75. M-294 connects to I-94, and although it doesn't loop back, it's numbered "like [a] 3dI" even though it's not a freeway.

[Bickendan]

I-205 and OR 205 have no relation, just coincidentally share numbers. Same with I-82 and OR 82, although a very loose argument could erroneously claim that OR 82's an 'extension' by way of I-84.

[Henry]

Many of the examples are mentioned on this Website:

http://chris295.tripod.com/

I'm surprised that no one mentioned MD 295 and DC 295; which are part of a longer road that also includes the Baltimore-Washington Parkway and I-295 itself! And then you also have VA 195, which runs into I-195 west of downtown Richmond.

[froggie]

I'm surprised that no one mentioned MD 295 and DC 295; which are part of a longer road that also includes the Baltimore-Washington Parkway and I-295 itself!

Perhaps because I-295/DC 295 do not directly connect to MD 295.  It's a common misconception that it's all one route, but it really isn't.  MD 295 officially ends at US 50, and arguably ends where NPS takes over jurisdiction just south of MD 175.  The short freeway leg between US 50 and the DC line is actually MD 201, and is signed as such both from US 50 and coming off Eastern Ave.