How many places are there where an Interstate continues as a state route

[hotdogPi]

I-393 continues as NH 9 (and US 4 and US 202).

[Pete from Boston]

I-393 continues as NH 9 (and US 4 and US 202).

Is that really 393 "continuing"?  None of those roads begin where 393 ends.  Once you open that can of worms this thread just becomes "How many places are there where an Interstate ends at a state highway?"

[froggie]

Until recently, I-295 started at the Beltway near the Wilson Bridge and then continued on the 11th Street Bridge into Downtown DC ending at I-395 in Capitol Hill.

Not quite correct there.  The Southeast Freeway between I-395/3rd St Tunnel and the 11th St Bridge has always been I-695...just wasn't signed until recently.  What I-295 did was cross the 11th St Bridge, then follow the Southeast Freeway stub to Pennsylvania Ave.  I-295 was to have continued around the east side of RFK, then skirt northwest more or less along Mt. Olivet Rd NE to meet I-95 on top of today's Amtrak rail yard (north of US 50/New York Ave and east of the 9th St NE bridge).

[froggie]

Continuing the original topic trend...not the same number, but MN 61 begins where I-35 ends in Duluth, MN.  And down in D'Iberville, MS, both MS 15 and MS 67 begin as a continuation of the I-110 roadway.

[english si]

So, we have the following same number, signed, examples

AL 759
AR 440
CA 15
CA 110
CA 210
CA 238
DC 295
IL 255
NY 390
NY 481
NY 590
NY 690
NY 787
NY 890
PA 283
VA 195
WI 794
and there's Clark County 215 in NV

[tdindy88]

I'd imagine that IN 265 is our state's only one, SR 57 used to qualify but now that is of course I-69. Once the East End Bridge is finished then the SR 265 moniker goes away to become I-265.

[froggie]

So, we have the following same number, signed, examples

NC 540 (mentioned earlier) missing from your list.

[agentsteel53]

I-229 in South Dakota turns into a dirt county road.  it is numbered as "476th St." - does that count as a numbering?  it should: the number is in accordance with an orderly and well-defined grid!

[bing101]

I noticed that Texas has two roads designated as 45 , TX-45 and I-45

http://en.wikipedia.org/wiki/Interstate_45

I-45 goes from Houston to Dallas

But TX-45 is within Austin, TX. I don't see any documents showing TX-45 at any point going to I-45. I am not sure how Texas DOT permit this to happen.

[hotdogPi]

I noticed that Texas has two roads designated as 45 , TX-45 and I-45

http://en.wikipedia.org/wiki/Interstate_45

I-45 goes from Houston to Dallas

But TX-45 is within Austin, TX. I don't see any documents showing TX-45 at any point going to I-45. I am not sure how Texas DOT permit this to happen.

Some states allow it, and some states don't.

[oscar]

I noticed that Texas has two roads designated as 45 , TX-45 and I-45

http://en.wikipedia.org/wiki/Interstate_45

I-45 goes from Houston to Dallas

But TX-45 is within Austin, TX. I don't see any documents showing TX-45 at any point going to I-45. I am not sure how Texas DOT permit this to happen.

It happens in other places in Texas. such as I-20, TX 20 in El Paso three counties west of I-20's west end, and TX Loop 20 in Laredo far south of I-20.

And don't get me started on duplicate numbering between regular and loop/spur state routes, such as 360 in the Dallas area and Loop 360 in Austin, or 151 in San Antonio and Loop 151 in Texarkana.

TxDOT seems not to care in the least about number duplication, at least if the same-numbered routes are in different parts of the state.

[bing101]

I never thought of that because i noticed that in some parts of california have historic us routes like us40 in solano and sacramento that are now city managed streets thats because caltrans removed us40 because i40 was assigned to the mojave area.

[NE2]

caltrans removed us40 because i40 was assigned to the mojave area.

No. Caltrans removed US 40 because their policy has generally been to move U.S. Routes to parallel freeways, and the freeway now had a new number.

[Brandon]

I noticed that Texas has two roads designated as 45 , TX-45 and I-45

http://en.wikipedia.org/wiki/Interstate_45

I-45 goes from Houston to Dallas

But TX-45 is within Austin, TX. I don't see any documents showing TX-45 at any point going to I-45. I am not sure how Texas DOT permit this to happen.

Lots of states "duplicate" numbers.  They usually use the prefix to separate types of routes, i.e. I-96 and M-96; I-64 (FAI-64) and IL-64 (SBI-64); I-64 and IN-64 (SR-64); etc.

To be frank, I find the states that do not use numbers like that a bit odd.

[Molandfreak]

holy crap http://en.wikipedia.org/wiki/Minnesota_State_Highway_62 http://en.wikipedia.org/wiki/Minnesota_State_Highway_101

[NE2]

holy crap http://en.wikipedia.org/wiki/Minnesota_State_Highway_62 http://en.wikipedia.org/wiki/Minnesota_State_Highway_101

62's a good example, but 101 is just two segments of a once-continuous route.

holy crap http://en.wikipedia.org/wiki/Florida_State_Road_145

There's also KY 3215: presumably two districts simultaneously used the same next available number and never fixed it.

[Molandfreak]

holy crap http://en.wikipedia.org/wiki/Minnesota_State_Highway_62 http://en.wikipedia.org/wiki/Minnesota_State_Highway_101

62's a good example, but 101 is just two segments of a once-continuous route.

holy crap http://en.wikipedia.org/wiki/Florida_State_Road_145

There's also KY 3215: presumably two districts simultaneously used the same next available number and never fixed it.

holy crap http://en.wikipedia.org/wiki/California_State_Route_146

[NE2]

holy crap http://en.wikipedia.org/wiki/California_State_Route_146

Another failure; that's defined as one continuous route that was simply never built in the middle.

[roadfro]

Going back to page two to address this question:

At the risk of taking the thread slightly off topic, I'd be curious how often an interstate dies this at both ends like 195 does (for now).

Nevada's I-580 continues as US-395 at the north end and ... some state route connector to US-395 at the south end (NV-431?)

Current south end is temporary US 50/395.  Not sure what state route designation it has (431 is about 15 miles north)

At the south end, Nevada I-580 stops at the William Street/US 50 interchange, so the freeway continues as US 50/395 (it's the permanent alignment for those two highways, not a temporary one). The open segment of Carson City Freeway without I-580 doesn't have a state route designation (it is in the NDOT highway logs as US 50).

The temporary alignment of US 50/395 is along Fairview Drive, forming the connection between the end of the freeway and the old alignment on Carson Street. Fairview Drive is not a state highway (nor has it ever been). To my knowledge, it's the only place in Nevada where a signed US highway (technically a "Temporary" route, according to AASHTO) is not maintained by NDOT.

[english si]

holy crap http://en.wikipedia.org/wiki/Florida_State_Road_145

There's also KY 3215: presumably two districts simultaneously used the same next available number and never fixed it.

3? is that it? That's good going. Northern Ireland had 3 in its original numbering!

Britain has lots.

[The Premier]

I-280 near Toledo continues as SR 420, which in turn ends at U.S. Highways 20 & 23.

[Mamba205]

I-255 in Missouri/Illinois turns into Illinois Route 255 after intersecting I-270 in Pontoon Beach, IL. It maintains Interstate Highway standards.

[dgolub]

(Also, I-495 does not at all connect to NY 495, unless you use FHWA definitions. NYSDOT's NY 495 is just the Lincoln Tunnel.)

Right, although this is an easy mistake to make because NY 495 is signed as I-495 in a batch of places, including on NY 9A.  So, a road signed as I-495 (but really designated NY 495) turns into NJ 495.

[Mapmikey]

I-229 in South Dakota turns into a dirt county road.  it is numbered as "476th St." - does that count as a numbering?  it should: the number is in accordance with an orderly and well-defined grid!

476th St is paved for the first 3 miles after the north end of I-229...

In the consolidated list above I-381 becoming VA 381 is missing
The Virginia CTB considered continuing I-464 as VA 464 but elected to make it VA 104 instead.

Mapmikey

[Bruce]

I-90 continues west from I-5/4th Avenue as WA-519 in Seattle.

I-405 continues west from I-5 in Southcenter as WA-518 as well as continuing north as WA-525 from I-5 in Alderwood/Lynnwood.

I-705 continues south as WA-7 from I-5 in Tacoma.