With the conversion of the trumpet interchange at US 22 and OH 126 into an at-grade roundabout in Cincinnati underway, this got me thinking, are there other examples of interchanges converted into a roundabout?
Edit: decided to include interchanges converted to at-grade intersections in general, to make this thread more inclusive.
Are you referring specifically to freeway-to-freeway type interchanges? Or things like standard diamonds being converted to dumbbells or dogbones?
Here's one example of a diamond becoming a pair of roundabounts: CTH-Y and I-43 in New Berlin, WI
https://www.google.com/maps/@42.9332295,-88.1606037,16.62z
Quote from: JoePCool14 on April 20, 2021, 11:33:55 PM
Are you referring specifically to freeway-to-freeway type interchanges? Or things like standard diamonds being converted to dumbbells or dogbones?
Here's one example of a diamond becoming a pair of roundabounts: CTH-Y and I-43 in New Berlin, WI
https://www.google.com/maps/@42.9332295,-88.1606037,16.62z
Sry that I wasn't clear in the op. I originally meant converted from an interchange an at-grade roundabout, but I suppose we can include conversions to dumbbells/dogbones here too, as I think my example is very rare, that the thread would die off instantly.
Though is a conversion from a diamond to dogbone an increase or decrease in capacity in the interchange? I'm still stuck on that thought.
Quote from: SkyPesos on April 20, 2021, 11:44:39 PM
Though is a conversion from a diamond to dogbone an increase or decrease in capacity in the interchange? I'm still stuck on that thought.
It depends on how many lanes, whether the diamond intersections had stop signs/traffic lights, traffic counts in each direction, amount of truck traffic, etc.
It's not a roundabout. But in the same vein, the former trumpet interchange connecting US 42 to the Ohio Turnpike was converted to a T-intersection a few decades ago.
The US 2/US 51 interchange in Hurley, WI is at the end of its life and will be rebuilt into a roundabout this construction season.
The junction of US 89, US 180, and I-40 Business in eastern Flagstaff, AZ used to be a trumpet interchange. It is now a simple traffic light.
https://maps.app.goo.gl/Y25Y7WCaLVuurXA26
Old US 56 and K-7/Lone Elm Road used to be a standard diamond, with US 56 being an undivided quasi-expressway at the time. But it was converted long ago to a standard four-way intersection. And US 56 was re-routed long ago to have more concurrency with I-35, because that's the way Kansas likes to do things.
Now that intersection is being converted to a continuous-flow intersection.
https://www.kansascity.com/news/local/community/joco-913/article250612999.html
Quote from: TheHighwayMan394 on April 21, 2021, 01:22:00 AM
The US 2/US 51 interchange in Hurley, WI is at the end of its life and will be rebuilt into a roundabout this construction season.
Why? The trumpet interchange might be slightly overbuilt, but it's fine as it is.
Quote from: thspfc on April 21, 2021, 08:34:26 AM
Quote from: TheHighwayMan394 on April 21, 2021, 01:22:00 AM
The US 2/US 51 interchange in Hurley, WI is at the end of its life and will be rebuilt into a roundabout this construction season.
Why? The trumpet interchange might be slightly overbuilt, but it's fine as it is.
I asked the same question somewhere. The answer was that the bridge needs to be totally replaced, and it's cheaper to build a roundabout, and that's more in line with traffic volumes and a full grade-separated interchange is overkill.
Quote from: hbelkins on April 21, 2021, 11:49:16 AM
Quote from: thspfc on April 21, 2021, 08:34:26 AM
Quote from: TheHighwayMan394 on April 21, 2021, 01:22:00 AM
The US 2/US 51 interchange in Hurley, WI is at the end of its life and will be rebuilt into a roundabout this construction season.
Why? The trumpet interchange might be slightly overbuilt, but it's fine as it is.
I asked the same question somewhere. The answer was that the bridge needs to be totally replaced, and it's cheaper to build a roundabout, and that's more in line with traffic volumes and a full grade-separated interchange is overkill.
That's going to be interesting, wonder if they will keep the slip-ramps, and just remove the flyover and attached ramps.
About 20 or so years ago, the former trumpet at the WI 29/124 interchange in Chippewa Falls, WI was replaced with a roundabout, this after WI 29 bypass was completed.
Mike
California examples:
- I-280 at 4th Street in San Francisco, originally one offramp off of northbound 280, now a full at-grade intersection of King Street and 4th Street
- Tower Bridge Gateway (former Route 275/former US 40 and 99W) at 5th Street in West Sacramento, formerly a partial diamond interchange, now a full at-grade intersection
- Oxnard Boulevard (former Route 1) at Channel Islands Boulevard Pleasant Valley Road in Oxnard, converted to intersection in the early 2000s as part of the move of Route 1 to Rice Avenue corridor (which now has an interchange here)
The 1960-ish folded diamond interchange that was previously at US 42/US 250 E/SR 96 in Ashland, OH was replaced with an at-grade intersection. The overpass was due for replacement and ODOT just decided it was better to remove the interchange entirely as US 42 has little through traffic anymore. https://goo.gl/maps/aPtxwHRbtgjk4LUJ8
At Williamstown, OH, old US 30 had a short 4-lane section that included an overpass going over US 68. An earlier iteration of US 30 was used as a connector. When the new US 30 alignment was built in the 2000s, the bridge over US 68 was ripped out and the junction was converted to an at-grade intersection. https://goo.gl/maps/fVVan4pfmi7o8Er36
Illinois
* Old US 66 at IL 17
* US 34 at US 30/Hill Avenue
* IL 58/Golf Road at IL 59 (the ramps in to/from EB IL 58 used to use this bridge (https://goo.gl/maps/LZwk5KE2ZsKA6Eqm9)
Missouri
* The southern US 63/US 160 intersection
* Forest Park Parkway at Kingshighway in St. Louis.
Streetview with interchange (https://goo.gl/maps/Uz6my2vjF6TeWFXq5)
Streetview of the intersection that replaced it (https://goo.gl/maps/FfF87sLDi9FU54Xt8)
* The intersection of Vandeventer Avenue with the little spur off US 40 (https://goo.gl/maps/bHDtfGeqe5htBqGV7)/ The spur used to continue on to Chouteau Avenue and have a 3/4 diamond with Vandeventer with the WB entrance being via a slip ramp from the Gratiot Street/St. Benards Lane intersection.
Iowa
* IA 415 at NE 66th Avenue: Streetview has the interchange, (https://goo.gl/maps/9xAcCPC72iszUrkNA) Google Earth shows the replacement intersection.
This intersection in Fort Pierre SD, just before the Missouri River bridge, was a grade-separated interchange until 2002: https://www.google.com/maps/@44.3683464,-100.3785227,3a,75y,55.48h,88.6t/data=!3m6!1e1!3m4!1s3nVZNG0JOFRVyE9IHVSFfQ!2e0!7i16384!8i8192
US-20/NY-5 at NY-96A was an interchange until about 1993 or so.
US 130 and NJ 33 near Hightstown, NJ used to be a directional interchange before NJDOT tore the US 130 bridge over NJ 33 westbound and the old PRR ROW for the current T intersection.
Quote from: DJ Particle on April 22, 2021, 11:57:44 PM
US-20/NY-5 at NY-96A was an interchange until about 1993 or so.
Some discussions occuring to downgrade 96A from four to two lanes. Doubt that will add up to much in the short term.
Wonder why the four lane section is there, though.
The trumpet interchange between US 13 and the PATP access road (new I-95) (https://www.google.com/maps/@40.1177271,-74.8464301,372m/data=!3m1!1e3?hl=en) was recently downgraded to a traffic signal.
Quote from: Rothman on April 23, 2021, 12:28:16 AM
Quote from: DJ Particle on April 22, 2021, 11:57:44 PM
US-20/NY-5 at NY-96A was an interchange until about 1993 or so.
Some discussions occuring to downgrade 96A from four to two lanes. Doubt that will add up to much in the short term.
Wonder why the four lane section is there, though.
Wow, I had no idea that used to be a full interchange at US 20/NY 5.
NY 96A carries more long-distance traffic than you might think because it's the main route between Rochester and Ithaca. I also wouldn't be surprised if the four-laning has something to do with the presence of the Seneca Army Depot.
Quote from: webny99 on April 23, 2021, 10:10:37 AM
Quote from: Rothman on April 23, 2021, 12:28:16 AM
Quote from: DJ Particle on April 22, 2021, 11:57:44 PM
US-20/NY-5 at NY-96A was an interchange until about 1993 or so.
Some discussions occuring to downgrade 96A from four to two lanes. Doubt that will add up to much in the short term.
Wonder why the four lane section is there, though.
Wow, I had no idea that used to be a full interchange at US 20/NY 5.
NY 96A carries more long-distance traffic than you might think because it's the main route between Rochester and Ithaca. I also wouldn't be surprised if the four-laning has something to do with the presence of the Seneca Army Depot.
AADTs don't require four lanes.
Quote from: Rothman on April 23, 2021, 04:34:28 PM
Quote from: webny99 on April 23, 2021, 10:10:37 AM
Quote from: Rothman on April 23, 2021, 12:28:16 AM
Quote from: DJ Particle on April 22, 2021, 11:57:44 PM
US-20/NY-5 at NY-96A was an interchange until about 1993 or so.
Some discussions occuring to downgrade 96A from four to two lanes. Doubt that will add up to much in the short term.
Wonder why the four lane section is there, though.
Wow, I had no idea that used to be a full interchange at US 20/NY 5.
NY 96A carries more long-distance traffic than you might think because it's the main route between Rochester and Ithaca. I also wouldn't be surprised if the four-laning has something to do with the presence of the Seneca Army Depot.
AADTs don't require four lanes.
AADT is 9.2k as of 2019, so it's not totally absurd. Presumably volumes have fallen in the past few decades, and/or were never as high as expected (as the interchange removal would suggest).
Quote from: webny99 on April 23, 2021, 05:35:40 PM
Quote from: Rothman on April 23, 2021, 04:34:28 PM
Quote from: webny99 on April 23, 2021, 10:10:37 AM
Quote from: Rothman on April 23, 2021, 12:28:16 AM
Quote from: DJ Particle on April 22, 2021, 11:57:44 PM
US-20/NY-5 at NY-96A was an interchange until about 1993 or so.
Some discussions occuring to downgrade 96A from four to two lanes. Doubt that will add up to much in the short term.
Wonder why the four lane section is there, though.
Wow, I had no idea that used to be a full interchange at US 20/NY 5.
NY 96A carries more long-distance traffic than you might think because it's the main route between Rochester and Ithaca. I also wouldn't be surprised if the four-laning has something to do with the presence of the Seneca Army Depot.
AADTs don't require four lanes.
AADT is 9.2k as of 2019, so it's not totally absurd. Presumably volumes have fallen in the past few decades, and/or were never as high as expected (as the interchange removal would suggest).
Yep, time for the four lanes to go.
I checked NY's AADT map, and it seems like if a 4 lane expressway is needed for access to Ithaca/Cornell, it would be NY 13 between Ithaca and I-81 in Cortland. It has the highest traffic counts for the highways into Ithaca, with at least 10k AADT the entire way between those two points.
In Ohio, most rural highways with above 10k AADT are 4-laned or under consideration for it. Not sure if NYSDOT have a similar threshold or not.
Personally, I do think 10K is reasonable, although sadly, NY gives no consideration to widening - even at volumes much higher than 10K. Four-lane divided non-freeways are exceptionally rare in NY and I would love to have more of them, including one or more four-lane routes to Ithaca.
Rochester > Ithaca is a royal pain. Every time I do it, it seems like you're on backroads forever.
I'm thinking the old Park Freeway in downtown Milwaukee is an example. I remember as a kid it was mostly an elevated freeway and now it's a surface street east of 43.
I don't know what the original section really had in terms of interchanges along it, but I imagine this is an example.
Quote from: webny99 on April 23, 2021, 08:16:20 PM
Personally, I do think 10K is reasonable, although sadly, NY gives no consideration to widening - even at volumes much higher than 10K. Four-lane divided non-freeways are exceptionally rare in NY and I would love to have more of them, including one or more four-lane routes to Ithaca.
Rochester > Ithaca is a royal pain. Every time I do it, it seems like you're on backroads forever.
The 4 lane section isn't that long. If there was a real need for it, it would have been expanded long ago.
Quote from: TheStranger on April 22, 2021, 04:49:33 PM
California examples:
- I-280 at 4th Street in San Francisco, originally one offramp off of northbound 280, now a full at-grade intersection of King Street and 4th Street
- Tower Bridge Gateway (former Route 275/former US 40 and 99W) at 5th Street in West Sacramento, formerly a partial diamond interchange, now a full at-grade intersection
- Oxnard Boulevard (former Route 1) at Channel Islands Boulevard in Oxnard, converted to intersection in the early 2000s as part of the move of Route 1 to Rice Avenue corridor (which now has an interchange here)
For the last of those, I think you meant Oxnard Blvd at Pleasant Valley Road -- the Oxnard Blvd / Channel Islands Blvd / Rose Ave intersection has been basically unchanged for decades, while the Oxnard Blvd (CA 1 S) / Pleasant Valley Rd / Rice Ave (now CA 1 N) intersection was greatly modified as part of the CA 1 rerouting.
Quote from: GaryA on April 24, 2021, 05:00:04 PM
Quote from: TheStranger on April 22, 2021, 04:49:33 PM
California examples:
- I-280 at 4th Street in San Francisco, originally one offramp off of northbound 280, now a full at-grade intersection of King Street and 4th Street
- Tower Bridge Gateway (former Route 275/former US 40 and 99W) at 5th Street in West Sacramento, formerly a partial diamond interchange, now a full at-grade intersection
- Oxnard Boulevard (former Route 1) at Channel Islands Boulevard in Oxnard, converted to intersection in the early 2000s as part of the move of Route 1 to Rice Avenue corridor (which now has an interchange here)
For the last of those, I think you meant Oxnard Blvd at Pleasant Valley Road -- the Oxnard Blvd / Channel Islands Blvd / Rose Ave intersection has been basically unchanged for decades, while the Oxnard Blvd (CA 1 S) / Pleasant Valley Rd / Rice Ave (now CA 1 N) intersection was greatly modified as part of the CA 1 rerouting.
Thanks!
Just made the correction.
A couple of other California examples:
- Washington Street at Junipero Serra Boulevard in Daly City, converted back to regular street intersection in the early 1970s to accommodate I-280 now having an offramp from Washington.
- Melrose Avenue at Colorado Boulevard in Eagle Rock, Los Angeles, was grade-separated with ramps as part of the original Colorado Freeway project for Route 134/Alternate US 66, before that portion of the Colorado Freeway was revamped when it became part of the Ventura Freeway. (Interestingly, further east, the interchange with Linda Vista Avenue/former Route 11 still remains to this day!)
Quote from: OCGuy81 on April 23, 2021, 10:12:54 PM
I'm thinking the old Park Freeway in downtown Milwaukee is an example. I remember as a kid it was mostly an elevated freeway and now it's a surface street east of 43.
I don't know what the original section really had in terms of interchanges along it, but I imagine this is an example.
There was a complete interchange around 5th/6th Sts west of the river and then at its temporary end at Broadway east of the river. The next interchange that was planned to the east was at Prospect/Farwell/Ogden, by the current tram terminal, then it was to curve southward to feed into the Hoan Bridge/I-794 with a street interchange at Clybourn.
The Prospect/Farwell/Ogden interchange would have been the major access to the city's upper east side.
Mike
Don't forget the PA Turnpike exit at US-13 in Bristol. The trumpet interchange was recently replaced with a signalized T-intersection (oddly, a loop road was built on part of the old loop-ramp footprint, at surface level, apparently for official use only.)
I've often said that when turnpike construction was in full swing back in the 50s and 60s, there was a tendency to put a trumpet ramp on the local road even if it really wasn't needed.
Quote from: mgk920 on April 25, 2021, 05:26:19 AM
Quote from: OCGuy81 on April 23, 2021, 10:12:54 PM
I'm thinking the old Park Freeway in downtown Milwaukee is an example. I remember as a kid it was mostly an elevated freeway and now it's a surface street east of 43.
I don't know what the original section really had in terms of interchanges along it, but I imagine this is an example.
There was a complete interchange around 5th/6th Sts west of the river and then at its temporary end at Broadway east of the river. The next interchange that was planned to the east was at Prospect/Farwell/Ogden, by the current tram terminal, then it was to curve southward to feed into the Hoan Bridge/I-794 with a street interchange at Clybourn.
The Prospect/Farwell/Ogden interchange would have been the major access to the city's upper east side.
Mike
I don't remember much about the Park Freeway living in SE Wisconsin as a kid, but a friend of mine who lives on Milwaukee's east side, said the demolition of it really spruced that area up.
Quote from: lepidopteran on April 26, 2021, 12:04:26 AM
Don't forget the PA Turnpike exit at US-13 in Bristol. The trumpet interchange was recently replaced with a signalized T-intersection (oddly, a loop road was built on part of the old loop-ramp footprint, at surface level, apparently for official use only.)
I've often said that when turnpike construction was in full swing back in the 50s and 60s, there was a tendency to put a trumpet ramp on the local road even if it really wasn't needed.
Kansas Turnpike Interchange 177 did a similar thing, where it used to have a trumpet connecting to Topeka Boulevard, but it was later replaced with a signalized intersection. In that case, it seems justified, for the sake of connecting Kansas Avenue to Topeka Boulevard and the Turnpike without building a larger interchange. Location: https://goo.gl/maps/nQirmMB2UUe1dajK7
***
A few other local ones, besides the one I mentioned earlier in the thread:
K-7 and Santa Fe Street/135th Street: https://goo.gl/maps/HEd2YkgXeDcs3Vne6
Johnson Drive and Roe Avenue, part of a larger interchange: https://goo.gl/maps/sCrxtu1XyWB1A8xD8
Half-interchange at Roe Avenue and Skyline Drive/48th Street (they might have even moved the whole cross-street for this one): https://goo.gl/maps/jYBk7NNGV4eNY3Uv8
Turner Diagonal and Riverview Avenue (fairly recent): https://goo.gl/maps/TToWZq1EBHoqMwKYA
Turner Diagonal and State Avenue, converted from three-way interchange to four-way intersection: https://goo.gl/maps/YwzTkXkdzgVmy3Lf7
Why do I feel like I'm missing one somewhere else that's local to me?