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

[Alps]

New York has quite a few of these: 390, 590, 690, 890, 481.  (NY 878 technically)

and 787.

Nope. I-787 turns onto NY 7 before ending across the bridge. So yes it continues as a state route, but not the one you think.

(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.)

[spooky]

New York has quite a few of these: 390, 590, 690, 890, 481.  (NY 878 technically)

and 787.

Nope. I-787 turns onto NY 7 before ending across the bridge. So yes it continues as a state route, but not the one you think.

I should have known this given the number of times I've driven it. So technically I-787 ends at the traffic light at 8th St, where the bridge terminates and joins Hoosick Street?

[The High Plains Traveler]

If you're willing to count provinces, then you have I-95 to New Brunswick Route 95.

And I-29 to MB 29 (very short connector in Emerson to the MB 75 highway to Winnipeg).

I believe the MB-29 designation has been eliminated, and 75 goes to the border to meet I-29. This is due to the closure of the U.S. 75 Noyes-Emerson border crossing. If you look at GSV, the road through Emerson, MB, which was where 75 turned, is now shown as MB-200 on the signs.

[Kacie Jane]

If these qualify, I-195 continues as NJ 29 at the western end, NJ 138 at the eastern end.

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).

[agentsteel53]

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?)

I'd look it up on Google Maps but it's all new and improved and enjoys crashing my browser, and showing up with "an error has occurred" for such forbidden actions as zooming in.

[TheStranger]

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)

I-515 in Vegas would fit (US 95 at each end of the route)

110 in Los Angeles used to until the Gaffey Street/state route 110 portion in San Pedro was decommissioned

[codyg1985]

I-440 continues as AR 440 north of I-40 in North Little Rock, AR.

[hm insulators]

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)

I-515 in Vegas would fit (US 95 at each end of the route)

110 in Los Angeles used to until the Gaffey Street/state route 110 portion in San Pedro was decommissioned

I-110 becomes California 110 north of the Four-Level in downtown Los Angeles.

[vdeane]

New York has quite a few of these: 390, 590, 690, 890, 481.  (NY 878 technically)

and 787.

Nope. I-787 turns onto NY 7 before ending across the bridge. So yes it continues as a state route, but not the one you think.

(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.)

Well, if you're using the official, hidden routing for I-787, you also have to invalidate 690 and 890.

If we're allowing different number continuations, I-790 continues as NY 5 on both ends and also as NY 8 and NY 12 on its western end.  I-587 continues as NY 28 on its western end and NY 32 on its eastern.  I-678 becomes the Hutchinson River Parkway, and I-895 becomes E 177th St.

[NE2]

Well, if you're using the official, hidden routing for I-787, you also have to invalidate 690 and 890.

I-690 and I-890 end at the I-90 interchanges. Calling a double trumpet a mainline and not a ramp is pretty close to the height of anality.

[roadman65]

If these qualify, I-195 continues as NJ 29 at the western end, NJ 138 at the eastern end.

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).

Interesting observation you bring up as that thought occurred to me as well.   I think you found a rarity even though like you said off topic a bit.

[Doctor Whom]

I-795 and one of the two MD 795's.

[TheStranger]

I-110 becomes California 110 north of the Four-Level in downtown Los Angeles.

Noted!  The question asked was specific to that example turning into a state route at BOTH ends (which was the case until a few years ago)...

...unless one considers that to be Route 47 at the south end now, and Route 110 north of 101 as has been the case since the 1980s.

[bassoon1986]

Not the same number, but
I-220 in Louisiana continues as LA 3132
I-510 continues as LA 47 at both ends

I-369 continues as AR 151 (for now)
I-45 continues as TX 87

I-69 in MS continues as MS 713 for now (not the best example as I-69 is in segments)

[Eth]

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).

I-575 continues as GA 5 on both ends (at the south end, via a brief concurrency with I-75). Same for I-516 and GA 21.

[amroad17]

I-295 in DC continues as DC 295.  One could argue that MD 295 could be that too, but the BW Parkway is unsigned and not exactly sure if MDSHA counts it as a hidden route 295 or not.

MD 295 begins at US 50; you have to use MD 201 to connect from DC 295 to MD 295. (The BW Parkway officially follows US 50 into DC, but MD 295 does not.)

So they have a route that otherwise is a surface street enter a freeway and have a number "hand-off" for no apparent reason whatsoever and still call most of the freeway MD 295 even though it doesn't continue anything... and to think there are even more illogical numbering situations around!

The big hand off is PA 283 to I-283 where PA 283 ends at I-283.  That is the strangest, although logical on paper I think.  I would rather see I-283 and PA 283 as one continuous route or even have I-283 continue to Lancaster.  PA has never been one to follow interstate guidelines, hence I-70 in Breezewood and what about I-70 from New Stanton to Washington, PA.  Tell me that is no different standards then PA 283 is.

The one in MD at least is not signed for the most part, so it really does not stick out except to maybe us.

Since PA 283 was reconstructed 10 years ago, it is of much better quality than I-70 south of Breezewood and between New Stanton and Washington.

[hbelkins]

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).

I-265 and KY 841 on both ends.

[froggie]

So they have a route that otherwise is a surface street enter a freeway and have a number "hand-off" for no apparent reason whatsoever and still call most of the freeway MD 295 even though it doesn't continue anything... and to think there are even more illogical numbering situations around!

This is a bit less convoluted than you make it out to be.

For starters, the section of Kenilworth Ave between the DC line and US 50 has long been designated MD 201...that designation predates both DC 295 and predates that section of Kenilworth Ave being upgraded to a freeway.

Second, it's very debatable as to whether the NPS section of the Baltimore-Washington Pkwy even has a route designation.

Lastly, very few people call the lower part of the B-W Pkwy (from US 50 to roughly MD 175) by the 295 number.  Most refer to the whole thing all the way to Baltimore as either the "Baltimore Washington Parkway" or call it the "B-W Parkway" for short.  So there really isn't the confusion factor you suggest, either.

[bugo]

I-265 and KY 841 on both ends.

I guess you're limiting this to state routes with the same number as the Interstates, right?  That would make this exercise more manageable.

[cwf1701]

One that could have been: in the mid-70s, what would be later be M-5 north of the I-275/I-696/I-96 junction was for a time (on paper) M-275.

[amroad17]

I-564 becomes VA 337 near the Naval Base in Norfolk, VA.
Historically, I-264 became VA 44 at the I-64 interchange in Norfolk.
I-464 transitions to US 17 in Chesapeake, VA. (and to some extent, VA 168)

[shadyjay]

I-691 in CT continues as CT 66.

Funny.... I was just remembering the other day about seeing the sign "NOTICE - 66 IS NOW 691" sign.  It was posted WB just past the Preston Ave/Exit 12 overpass.  This was in the 80s. 

Why didn't I take pictures of signs back in those days???

[bugo]

Why didn't I take pictures of signs back in those days???

I ask myself the same question all the time.  My answer is that I didn't have a camera when I was a kid, and if I had developing the photos was expensive for a 10 year old and my parents were always broke.  A roll of film held a fixed number of exposures, and you couldn't just look at the screen to see if the picture turned out OK.  I wish the digital camera had come to market 30 years before it did, and if so I would have tens of thousands of now historic road pictures.  A lot of us would.

[TEG24601]

Depending on your point of view, you could consider that I-84 continues West of Portland, OR as either US-26 or US-30.  While is isn't a direct connection, due to the I-5/I-405 loop around downtown, there is a large amount of traffic that crosses the city from either US route to I-84.


I-90's Western Terminus continues as SR-519 in Seattle, which in turn continues as two state routes on the western ends of the ferry routes.


I-180 continues South of I-80 in Cheyenne as US 85.


I-182 continues East of Tri-Cities, WA as US 12 (SR-12)

[mrsman]

So they have a route that otherwise is a surface street enter a freeway and have a number "hand-off" for no apparent reason whatsoever and still call most of the freeway MD 295 even though it doesn't continue anything... and to think there are even more illogical numbering situations around!

This is a bit less convoluted than you make it out to be.

For starters, the section of Kenilworth Ave between the DC line and US 50 has long been designated MD 201...that designation predates both DC 295 and predates that section of Kenilworth Ave being upgraded to a freeway.

Second, it's very debatable as to whether the NPS section of the Baltimore-Washington Pkwy even has a route designation.

Lastly, very few people call the lower part of the B-W Pkwy (from US 50 to roughly MD 175) by the 295 number.  Most refer to the whole thing all the way to Baltimore as either the "Baltimore Washington Parkway" or call it the "B-W Parkway" for short.  So there really isn't the confusion factor you suggest, either.

The DC DOT recently made this 295 designation much simpler.

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.  Meanwhile DC 295 started just before the 11th Street Bridge and headed towards the 50/BW interchange.  So in essence in Anacostia, I-295 split into two separate routes: I-295 and DC 295. 

But now that they've instituted the I-695 designation for the freeway connection between Anacostia and Capitol Hill, and 295 is one roadway.

To really simplify things, of course, they should convince the Nat'l Park Service to designate the BW Parkway as some kind of Federal-295.

In my view, I'd like all limited access highways (GW Pkwy, BW Pkwy, NYC area parkways, La Cienega Expressway in L.A.) to be designated with some kind of route number, even if it's not an official state highway.  It will definitely ease navigation.


As far as 283 in Penn., there isn't as much confusion on the signage as there is on the map.  I would also like to see I-283 extended to Lancaster and I would post the stub routes (connection to 230 and connection to the Turnpike) as two different state routes. 

So if going southbound, I'll see I-283 to Lancaster but PA XXX to I-76 to Philly and Pittsburgh.