Do not want slip ramps from freeway to service/ frontage roads, but one like NJ 21 & NJ 7 in Belleville, NJ.
The aforementioned one above is an interchange that has one NB ramp from Route 21 to NJ Route 7. NJ 7 has no ramps onto the NJ 21 freeway in either direction as well as SB NJ 21 having no ramp to NJ 7.
Also I-280 in Newark, now has one ramp EB to MLK Jr. Blvd after the NJ 21 interchange got reconfigured a few years ago. Originally that one had three ramps lacking a WB entrance only. Now the WB ramp for both Broad Street and MLK Blvd via State Street is gone and the EB entrance from MLK Jr. is since been removed.
Any others like these two in NJ?
The only one I can think about is at I-94 eastbound to IL-50 Cicero Ave southbound. That's the only ramp there, though the other movements are covered by nearby Foster Ave and Peterson Ave/Caldwell Ave exits.
https://www.google.com/maps/@41.9823123,-87.7516024,16.25z
I-90 EB to Carnegie Ave in Cleveland.
I-64 WB exit 28B to Clayton Rd in St Louis (https://www.google.com/maps/@38.6354387,-90.3949909,15.8z)
I-94 Exit 239A in St. Paul, MN, a single westbound off-ramp to Hamline Ave.
Due to ramp closures related to the I-40 Desoto Bridge closure in Memphis, I-55/Metal Museum Dr (Exit 12C) is effectively a "one-ramp interchange", with only the southbound exit ramp remaining open.
I-95 Exit 12 near Emporia, VA is a single northbound exit ramp to northbound US 301.
I-78 Exit 58 in Allentown, PA consists of one ramp from westbound I-78 to southbound Emaus Avenue.
https://www.google.com/maps/@40.5637555,-75.4763996,17.25z?hl=en
The on-ramp from US 5 (Main St) to I-84 West in East Hartford, CT. Also used to be a single entrance ramp to I-91 North in Windsor from Bina Ave before I-291 was constructed
US-64 in Creswell, NC (https://www.google.com/maps/@35.8754898,-76.4065301,16.33z)
Former example: NB Keystone at 146th Street (https://www.google.com/maps/@39.9903544,-86.1191918,3a,75y,310.55h,85.88t/data=!3m7!1e1!3m5!1sAKHUxWcaPLTRFdBSayIwIA!2e0!5s20160901T000000!7i13312!8i6656). SB onramp added in 2019.
I-481 Exit 11 Caughdenoy Rd., Maple Rd. in North Syracuse, NY
https://goo.gl/maps/2ixJm7PSiXBkr4Zn8
I-95/Dedham Street, exit has been around for a while, more ramps under construction
https://www.google.com/maps/@42.1926242,-71.1522875,17z
I-390 southbound Exit 15B, Brighton—Henrietta Town Line Road, Rochester suburbs
https://www.google.com/maps/@43.0965261,-77.6023857,769m/data=!3m1!1e3
US 15 [Future I-99] southbound Exit 143, PA 973, north of Williamsport
https://www.google.com/maps/@41.3207001,-77.0946958,559m/data=!3m1!1e3
Long-ago example: NY 17, prior to construction of the Corning bypass, had an un-numbered [could have been 45, but wasn't] westbound exit to the village of Riverside
Here's a really stupid one! Business Spur I-196. You can only exit onto it going EB on I-196. There is no entrance ramp returning to EB I-196 and since it's a spur, the route doesn't complete a loop. There is a ramp back to WB I-196, but there is no exit from WB I-196 to Business Spur I-196. Apparently they designed it this way because for whatever reason they didn't want anyone continuing in the same direction after exiting. I would also question why they built such long ramps to a parallel roadway in the first place, especially since the same road has a full interchange with I-196 a few miles back. And then there is the question of whether this actually serves as a practical business route.
https://www.google.com/maps/place/I-196,+Grandville,+MI/@42.9316076,-85.7502946,14z/data=!4m5!3m4!1s0x8810ab49a162566f:0xedfb017b6f9408cd!8m2!3d42.9251398!4d-85.7496504
Omaha has the WB I-80 exit ramp to Q Street. There's also the SB US 75 to EB I-480 exit ramp to 24th Street by the Creighton campus.
The Freehold Bypass (NJ-33) has an interchange with Howell Rd consisting of a sole SB-WB onramp.
Exit 41 of I-68 is a single WB offramp.
Southbound I-35 to 37th Avenue in Kansas City, Kansas sort of counts, and it used to count more, because the off-ramp used to be separate from the ramp to Southwest Boulevard and Mission Road. https://goo.gl/maps/W7kiyAFwoXzJiCjK7
A prior thread about this topic can be found at the following:
https://www.aaroads.com/forum/index.php?topic=8980.msg208892#msg208892
There are a lot of partial intersections on I-94 on the west side of Detroit near US-12. A couple of them are single-ramp.
https://www.google.com/maps/@42.3309629,-83.1439762,16z?hl=en
A bunch of these in Seattle.
I-5 Northbound to Madison Street (https://www.google.com/maps/@47.6039511,-122.3268585,3a,75y,3.29h,95.89t/data=!3m6!1e1!3m4!1se5puB06_Hb9HDBkrk3cgJw!2e0!7i16384!8i8192)
I-5 Southbound to Airport Way (https://www.google.com/maps/@47.5947991,-122.3209453,3a,75y,192.26h,92.08t/data=!3m6!1e1!3m4!1sCc2Rk-H3InHREXCMjhypOA!2e0!7i16384!8i8192)
I-5 Southbound to 6th Avenue South/Forest Street (https://www.google.com/maps/@47.579335,-122.3194064,3a,75y,188.17h,107.43t/data=!3m6!1e1!3m4!1sg-oPjqAXq66evtVBrJ9UFw!2e0!7i16384!8i8192)
Chris
Old MA 15 onramp to I-84 WB just north of the CT/MA border. (https://www.google.com/maps/@42.0351324,-72.1280276,16.25z?hl=en)
Mass Ave onramp to I-90 WB in Boston (https://www.google.com/maps/@42.3480789,-71.0893824,18z?hl=en)
14th Street ramp to WB I-94 in Hudson WI.
Michigan St to northbound I-35 in Duluth, MN
TRUCK US 2/Winter St to westbound US 2 in Superior, WI (which really makes no sense as EB trucks on the Bong Bridge heading for this truck route then have to turn and drive several blocks *west* on Belknap Street to reach the truck route)
US 50 eastbound at Aerojet Road, Rancho Cordova. Somewhat redundant with the Hazel Avenue exit nearby
https://www.google.com/maps/@38.6288075,-121.2364093,14z
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Numerous examples on US 101 in California:
This one may or may not count: Whittier Boulevard (former US 101) onramp onto US 101 north (Santa Ana freeway), in Los Angeles - which technically may be part of the 7th Street interchange complex:
https://www.google.com/maps/@34.0368623,-118.2232476,17z
Another "may or may not count" - US 101 north (Santa Ana Freeway) to Spring Street in LA, if considered separate from the two ramps to Broadway:
https://www.google.com/maps/@34.056629,-118.245406,16z
US 101 (Hollywood Freeway) northbound exit for Barham Boulevard in Hollywood, ramp goes to East Cahuenga Boulevard (former US 101)
https://www.google.com/maps/@34.1251855,-118.3458493,17z
US 101 (Ventura Freeway) southbound exit for Ventura Road, Oxnard
https://www.google.com/maps/place/N+Ventura+Rd,+Oxnard,+CA/@34.2410025,-119.1897383,17z/data=!4m5!3m4!1s0x80e84c4d6706b0b7:0x2d174418f6fb22e1!8m2!3d34.2266188!4d-119.1944375
US 101 south at Carpinteria Avenue (former US 101), Carpinteria
https://www.google.com/maps/@34.4029308,-119.5388106,16z
US 101 north at Pueblo Street, Santa Barbara
https://www.google.com/maps/@34.4270591,-119.7264215,17z
Price Street onramp to US 101 south, Shell Beach
https://www.google.com/maps/@35.1545178,-120.6666694,17z
US 101 north (Bayshore Freeway) at Dore Avenue, San Mateo
https://www.google.com/maps/@37.5791902,-122.3216557,17z
US 101 south (Bayshore Freeway) exit for Paul Avenue (actually feeding into Mansell Street at San Bruno Avenue), San Francisco. In the last 10 years CalTrans renamed the exit for northbound Bayshore Boulevard as "Paul Avenue" even though that was always part of the 3rd Street/Bayshore Boulevard exit complex, so not sure if this still counts.
https://www.google.com/maps/place/Mansell+St+%26+San+Bruno+Ave,+San+Francisco,+CA+94134/data=!4m2!3m1!1s0x808f7f1fe4023c1f:0xee48ed79aa491080?sa=X&ved=2ahUKEwjKhLnk4r_xAhVkHzQIHRIWBvsQ8gEwAHoECAYQAQ
US 101 north (Bayshore Freeway) at Vermont Street, San Francisco
https://www.google.com/maps/place/Vermont+St+%26+Mariposa+St,+San+Francisco,+CA+94107/@37.7634007,-122.4066025,17z/data=!3m1!4b1!4m5!3m4!1s0x808f7e339e692669:0x622c6fc3e938efe1!8m2!3d37.7634007!4d-122.4044138
US 101 north (Redwood Highway) at Arata Lane, Windsor
https://www.google.com/maps/place/Arata+Ln,+California+95492/@38.5674873,-122.8346167,15z/data=!4m5!3m4!1s0x80841600e2c3d121:0x270f0d35d633b7e6!8m2!3d38.5619927!4d-122.8106681
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Not built yet, but planned already on a newer road: Santa Mesa Bridge (G. Araneta Avenue) onramp for Metro Manila Skyway northbound, in San Juan/Quezon City. No corresponding southbound ramp slated for this spot:
https://www.openstreetmap.org/search?query=N.%20Domingo%20%26%20G.%20Araneta#map=18/14.60354/121.02053
The WA-99 Freeway in South Seattle has a single northbound on-ramp from S Cloverdale Street:
https://goo.gl/maps/aaNFHXpFQiX2ZQRQ7
The closest parallel off-ramp is to 5th & Kenyon, seven blocks north-north-west.
San Diego has two consecutive exit ramps on NB CA 163 (https://www.google.com/maps/@32.7366701,-117.1566028,16.2z?hl=en) in Balboa Park going to Balboa Dr and Richmond St respectively.
When I lived in Portland, I was a couple of blocks from the Taylors Ferry Road exit on NB I-5, right after it ducked under the Barbur Blvd./SW Capitol bridge at the top of the I-5 grade over the west hills. It was an isolated single ramp emptying out onto the intersection of SW 35th Ave. and SW Taylors Ferry Road; lost count of how many times I used it!
The Downtown Connector (I-75/85) in Atlanta has a couple of these, but it could be argued that these single ramps work in combination with other partial interchanges to provide complete access.
Exit 249A, Courtland St has only a SB off-ramp (no NB ramps, no on-ramps). But when combined with the interchange of I-75/85 and A. Young International Blvd and Ellis St, it provides a ramp that is missing from that interchange.
Exit 249B, "Pine St/Peachtree St", has only a NB off-ramp (no SB ramps, no on-ramps). The adjacent interchange 249C is missing a NB off-ramp.
There's also an on-ramp from Highland Av onto I-75/85 NB, although drivers in that area could have simply used the Ellis St or J. Lewis Freedom Pkwy on-ramps.
All three of those ramps should be visible at this link https://goo.gl/maps/k6Zc1VMDJ9iKJbEn7
Quote from: ran4sh on June 30, 2021, 06:38:29 PM
The Downtown Connector (I-75/85) in Atlanta has a couple of these, but it could be argued that these single ramps work in combination with other partial interchanges to provide complete access.
Exit 249A, Courtland St has only a SB off-ramp (no NB ramps, no on-ramps). But when combined with the interchange of I-75/85 and A. Young International Blvd and Ellis St, it provides a ramp that is missing from that interchange.
Exit 249B, "Pine St/Peachtree St", has only a NB off-ramp (no SB ramps, no on-ramps). The adjacent interchange 249C is missing a NB off-ramp.
There's also an on-ramp from Highland Av onto I-75/85 NB, although drivers in that area could have simply used the Ellis St or J. Lewis Freedom Pkwy on-ramps.
All three of those ramps should be visible at this link https://goo.gl/maps/k6Zc1VMDJ9iKJbEn7
There are plenty of places where single ramps are part of a larger complex that make a half or full interchange. That's why I didn't mention this area of I-55 in St Louis (single ramps to Potomac and Broadway and from Cherokee and President (https://www.google.com/maps/@38.5891061,-90.2133088,16.74z?hl=en)) or this single ramp to Lake St (https://www.google.com/maps/@41.8856274,-87.645375,18z?hl=en) just north of the Circle Interchange. FWIW You're not the only one who posted a ramp like the Highland Av ramp. Just using your post as an example. And the Peachtree and Courtland ramps certainly qualify as one-ramp interchanges.
One way to count single ramp interchanges is if your state DOT publishes official diagrams of their interchanges, and there's only one ramp on it. See this onramp at the very north end of the infamous I-705: https://www.wsdot.wa.gov/mapsdata/tools/InterchangeViewer/pdf/SR705/705X002.pdf
Quote from: ErmineNotyours on July 01, 2021, 12:08:19 AM
One way to count single ramp interchanges is if your state DOT publishes official diagrams of their interchanges, and there's only one ramp on it. See this onramp at the very north end of the infamous I-705: https://www.wsdot.wa.gov/mapsdata/tools/InterchangeViewer/pdf/SR705/705X002.pdf
The site of my only car accident. People merge into one lane in the on-ramp corner (as it turns into 705 from A St) rather than on the straight-away after the corner (where the two lanes actually come together). Had someone merge into me.
It can be a pretty hairy merge. Usually requires right-lane traffic to either quickly form a gap or just merge over.
I seem to recall a ramp from I-95 north to Churchmans Road appearing on the 1994 edition of ADC's New Castle County, Delaware map book.
Questionable whether or not this counts, but the only one I can think of in Utah is I-215 northbound exit 4 (https://www.google.com/maps/@40.6817991,-111.7974128,16.64z).
I say questionable because there is a southbound exit 4 just a bit north at 3900 South, and northbound exit 4 provides a missing ramp there... but it also serves that role for southbound exits 3 and 5, and it is even signed as "3300 South/3900 South", so you could probably argue it is its own northbound thing. For whatever reason that stretch of I-215 was built with a ton of partial interchanges and missing ramps and seems to have a very different character than most other Wasatch Front freeways.
At Uniontown, PA, there is a single ramp from US 40 WB to Morgantown Road. All other movements are handled via US 119. https://goo.gl/maps/sQ4s7QCh7fJuYC1E6
At Cumberland, MD, there is a single ramp from I-68 WB to Seton Drive. Cumberland's main hospital used to be off this exit, which I assume is why it was built. https://goo.gl/maps/jXzdXN8bL11u2vLL9
Near Brilliant, OH, SR 7 northbound has a single ramp to Salt Run Road. There is a conventional diamond interchange about a mile north. I think this ramp was built to avoid backtracking for trucks serving a power plant. https://goo.gl/maps/7aXFns92t6Dk5NYv5
On the other side of Brilliant, there is a single ramp to SR 7 northbound. https://goo.gl/maps/9act6jbQtq1GoZn4A
Here's one that definitely counts: I-80 exit 352B in Wells, NV (https://www.google.com/maps/@41.0987867,-114.9573583,15.85z).
Looks like they just converted the original US 40 roadway into a westbound exit ramp, in addition to the full diamond at US 93 just to the west.
On BC-99 in White Rock, there is a single southbound off-ramp to southbound 152 St (Exit 8A):
https://goo.gl/maps/8rFK8UJHtEH3ncoH6
May not count as it's preceded by exit 8B, a half SPUI; I'll let others look and decide for themselves whether it's too close to the preceding interchange.
There are no ramps to/from the south at all, until you get to 16 Ave a few kilometres south.
I-64 at Great Bridge Rd is like this. Not sure how long it will remain like that though, with the new High Rise Bridge...
Quote from: MCRoads on July 01, 2021, 04:14:57 PM
I-64 at Great Bridge Rd is like this. Not sure how long it will remain like that though, with the new High Rise Bridge...
No clue how I forgot about this one, though it sort of functions as the missing I-64 -> US-17 SB movement, but technically a different exit number altogether.
It will remain even when the new High Rise Bridge is complete.
Quote from: jakeroot on July 01, 2021, 01:24:23 PM
On BC-99 in White Rock, there is a single southbound off-ramp to southbound 152 St (Exit 8A):
https://goo.gl/maps/8rFK8UJHtEH3ncoH6
May not count as it's preceded by exit 8B, a half SPUI; I'll let others look and decide for themselves whether it's too close to the preceding interchange.
There are no ramps to/from the south at all, until you get to 16 Ave a few kilometres south.
One ramp aside, I've never seen a half SPUI before. Thanks for sharing that.
Quote from: wanderer2575 on July 01, 2021, 05:24:46 PM
Quote from: jakeroot on July 01, 2021, 01:24:23 PM
On BC-99 in White Rock, there is a single southbound off-ramp to southbound 152 St (Exit 8A):
https://goo.gl/maps/8rFK8UJHtEH3ncoH6
May not count as it's preceded by exit 8B, a half SPUI; I'll let others look and decide for themselves whether it's too close to the preceding interchange.
There are no ramps to/from the south at all, until you get to 16 Ave a few kilometres south.
One ramp aside, I've never seen a half SPUI before. Thanks for sharing that.
Here's a half SPUI without an overpass or underpass (https://www.google.com/maps/@32.2206193,-110.96208,114m/data=!3m1!1e3)
Oddball Franken-SPUI at the very western entrance to I-90. (https://www.google.com/maps/@47.5902254,-122.33017,260m/data=!3m1!1e3) The only movement east of the interchange is away from the interchange, so there's no traffic from the east to take care of. At one point, Atlantic Avenue (Edgar Martinez Way) was going to be an eastbound couplet to a full access westbound bridge north of the stadium, but those plans changed.
Exit 26 on CT 9 in New Britain is a single exit ramp northbound. (It's pretty close to other interchanges, but no others are exit 26. Also, I don't know the reason for exit 28A. I don't think it got added after the CT 9 / SR 506 extension in 1986. How did it catch planners by surprise?)
I-95 southbound Exit 74B in Richmond, VA consists of a single ramp to Franklin Street and North 15th Street, with no reentry to I-95 and no direct access from the northbound side.
It's numbered 74B because the interchanges with Broad Street (US 250) (exit 74C), Franklin Street (74B), and the Downtown Expressway (VA 195) (74A) are in close proximity, it isn't actually part of either of the other interchanges.
Some more California examples:
I-5 northbound onramp from California Street, Oceanside:
https://www.openstreetmap.org/#map=17/33.18555/-117.36018
I-5 northbound onramp from Stonehill Drive, San Juan Capistrano:
https://www.openstreetmap.org/#map=16/33.4761/-117.6790
I-5 northbound onramp from Orangethorpe Avenue, Buena Park and northbound offramp to Auto Center Drive (former US 101)
https://www.openstreetmap.org/#map=17/33.85969/-117.98669
I-5 northbound exit to Crag View Drive in Shasta County
https://www.openstreetmap.org/#map=16/41.1737/-122.2899
^^^
I love OSM as much as the next guy, but it's not very helpful (at least to me) in cases like this as there is neither satellite nor street view on OSM, two things that I find helpful when looking at examples of just about anything.
(emphasis on personal opinion -- others may be perfectly happy with OSM)
Another one in Washington:
I-5 @ College Street in Lacey. (https://www.google.com/maps/@47.0455949,-122.8345419,3a,75y,69.59h,70.03t/data=!3m6!1e1!3m4!1s4Tj0XjUaz-I9VVp9ufN83A!2e0!7i16384!8i8192)
Chris
There are several on the Don Valley Parkway in Toronto. The DVP going northbound from Downtown is initially entry-only (4 entrances) with no exits until the Bayview-Bloor ramp, which would be the first exit going northbound.
I have highlighted the entrances using arrows because for some reason the ramps are white coloured instead of the usual orange colour on GMaps. Second image shows the fourth entrance ramp and the Bayview Bloor Ramp.
(https://i.imgur.com/DP2ml5C.png)
(https://i.imgur.com/Eo6vhRH.png)
One that I'm pretty familiar with but had forgotten until now: the Don Bosco exit off of northbound Metro Manila Skyway in Makati. There's no corresponding onramp in any direction:
https://www.google.com/maps/@14.5453495,121.0145702,18z
Quote from: epzik8 on July 01, 2021, 07:15:23 AM
I seem to recall a ramp from I-95 north to Churchmans Road appearing on the 1994 edition of ADC's New Castle County, Delaware map book.
If they showed a ramp there, it was printed in error. Such a ramp didn't exist at that location.