I was driving in Indy and realized that at I465 and Sam Jones Pkwy (former Airport Expressway) INDOT has put a diamond there.
What was wrong with the old interchange? http://www.in.gov/indot/images/MPA465_SamesJonesExpressway_2012.jpg
That's not the only place in Indy where it's gotten worse. INDOT has replaced cloverleafs with partial cloverleafs. I don't see how this is a upgrade. I don't think it's an upgrade if traffic has to stop where it didn't before. I know some are going to say it's to busy for a cloverleaf, but what I have to say is people need to quit being stupid, pay attention, and learn how to drive.
There are also other places where interchanges are getting "downgraded". I don't understand why DOT's want to stop traffic.
Quote from: US 41 on December 05, 2013, 09:59:12 AM
That's not the only place in Indy where it's gotten worse. INDOT has replaced cloverleafs with partial cloverleafs. I don't see how this is a upgrade. I don't think it's an upgrade if traffic has to stop where it didn't before. I know some are going to say it's to busy for a cloverleaf, but what I have to say is people need to quit being stupid, pay attention, and learn how to drive.
This might be an interesting thread to you. It describes the benefits of the parclo B4 partial cloverleaf design vs. the parclo A4 in respect to reducing driver delay. Out of curiosity, what design was selected in Indy when converting the full cloverleafs to partial cloverleafs?
https://www.aaroads.com/forum/index.php?topic=7967.msg182859#msg182859
Quote from: US 41 on December 05, 2013, 09:59:12 AM
I know some are going to say it's to busy for a cloverleaf, but what I have to say is people need to quit being stupid, pay attention, and learn how to drive.
Right. Because that works so well to solve the problem *everywhere* else.
An interchange near me underwent such a transformation. I'm pretty sure it was designed by that guy that finished at the bottom of the class but just good enough to pass. 2 of the issues I have (not include the addition of traffic lights) at this particular interchange: The traffic light was designed with a crosswalk button 3 feet beyond a guardrail. And the very obvious low point in the roadway doesn't have a drainage inlet, subjecting the area to flooding.
In PA there's the PA 581/US 15 interchange, where traffic bypassing Harrisburg traveling between DC and western NY now has to stop at a light. NYSDOT also recently installed a traffic light at what was once loop ramps on Burrstone Road in Utica.
Getting rid of weaving movements is a Good Thing.
Quote from: US 41 on December 05, 2013, 09:59:12 AM
I was driving in Indy and realized that at I465 and Sam Jones Pkwy (former Airport Expressway) INDOT has put a diamond there.
What was wrong with the old interchange? http://www.in.gov/indot/images/MPA465_SamesJonesExpressway_2012.jpg
That's not the only place in Indy where it's gotten worse. INDOT has replaced cloverleafs with partial cloverleafs. I don't see how this is a upgrade. I don't think it's an upgrade if traffic has to stop where it didn't before. I know some are going to say it's to busy for a cloverleaf, but what I have to say is people need to quit being stupid, pay attention, and learn how to drive.
There are also other places where interchanges are getting "downgraded". I don't understand why DOT's want to stop traffic.
I am guessing, in this case, it is because traffic counts at this location have declined since this is no longer the main access to the IND airport terminal, and thus the interchange is being rebuilt to a lower design standard. I do agree with you, though, in that it does not seem like a good idea to place at-grade intersections at what is essentially a freeway to freeway junction.
Also, it would appear that cloverleafs (cloverleaves?) are falling out of favor with state DOTs due to the weaving issues inherent in that design. Louisiana DOTD just completed rebuilding the I-10/Causeway Boulevard interchange to remove the most egregious merging/weaving choke points, essentially rendering it a weird variant of cloverleaf with flyover ramps.
Quote from: hbelkins on December 05, 2013, 01:33:00 PM
Getting rid of weaving movements is a Good Thing.
Getting good signal progression along a corridor is a good thing too. Engineers could achieve both if they just designed more Parclo B4s!
Trying to decide if I should use this thread as an opportunity to complain about SPUIs...
Quote from: Urban Prairie Schooner on December 05, 2013, 01:40:34 PM
Also, it would appear that cloverleafs (cloverleaves?) are falling out of favor with state DOTs due to the weaving issues inherent in that design. Louisiana DOTD just completed rebuilding the I-10/Causeway Boulevard interchange to remove the most egregious merging/weaving choke points, essentially rendering it a weird variant of cloverleaf with flyover ramps.
Wow, that is a weird one (http://goo.gl/maps/s5lJj). :crazy:
Quote from: getemngo on December 05, 2013, 01:47:11 PM
Trying to decide if I should use this thread as an opportunity to complain about SPUIs...
Any particular SPUI you have in mind? :-D :-D :-D :-D
Actually, I don't have any problems with them. What do you dislike about them?
CT has restriped certain areas and in the process downgraded the lanes in a few spots. The reson being there isn't as muc traffic to warrant it.
I-84 EB Waterbury between Exit 21 & 22, the aux lane was taken out and now there isn't enough merge time for the vehicles at the preceding on-ramp.
Also, the new Exit 26 off-ramp designed and striped for 2-right turn lanes and 1 left turn lane was restriped with one right turn lane and one left turn lane. Why? Idk
However, if they can downgrade why can't they upgrade!? There are many places to add in turn lanes and not having to widen the road but it never gets done.
not too many interchanges have been down graded here. I-395 and CT-82 was reconstructed and they took away some free movements with stoplights.
Quote from: getemngo on December 05, 2013, 01:47:11 PM
Trying to decide if I should use this thread as an opportunity to complain about SPUIs...
Heck, go for it! I think it's relevant to this thread as the OP is mentioning having to stop after the upgrade when before they never had to. You don't run across many unsignalized SPUI's! On the other hand, here is an example of an unsignalized parclo B4 interchange along a 6-lane boulevard in Florida.
https://maps.google.com/?ll=26.06264,-80.35486&z=16&t=h
Quote from: hbelkins on December 05, 2013, 03:47:40 PM
Actually, I don't have any problems with them. What do you dislike about them?
I don't
hate SPUIs, and I do think they're really good for replacing diamonds in tight spaces with high traffic counts. It's also really fun to zip across all those lanes once the light turns green when you're exiting and turning left. :bigass: No second intersection!
But they're called Single Point
Urban Interchanges. In urban areas, they're great. Where there's more space, I (like Tradephoric) would prefer a parclo.
I'm from a state where 1) permissive left turns are very common, and 2) the Michigan Left reduces the number of phases needed at a lot of signals. So I'm used to short lights. At a SPUI, I feel like the red light lasts
forever, especially when turning left to enter the freeway - and it can screw up the timing of nearby signals. Admittedly, "They run counter to what I feel are my state's practices, but they're probably great with your state's practices" may not be the best argument.
However, I've also seen a number of head-on collisions from traffic exiting SPUIs, and it isn't fun to cross an angled, unsignalized entrance ramp as a pedestrian, so I'm a bit concerned about their safety record too. It's hard to find another type of intersection with that much uncontrolled pavement.
Quote from: tradephoric on December 05, 2013, 04:14:47 PM
Quote from: getemngo on December 05, 2013, 01:47:11 PM
Trying to decide if I should use this thread as an opportunity to complain about SPUIs...
Heck, go for it! I think it's relevant to this thread as the OP is mentioning having to stop after the upgrade when before they never had to. You don't run across many unsignalized SPUI's! On the other hand, here is an example of an unsignalized parclo B4 interchange along a 6-lane boulevard in Florida.
https://maps.google.com/?ll=26.06264,-80.35486&z=16&t=h
Of course, a B4 parclo doesn't really need signals like an A4 does.
However, that said, A4s without signals do exist. US-51/US-51 Business and I-74 in Bloomington, Illinois (https://maps.google.com/maps?hl=en&ll=40.436161,-88.990459&spn=0.004744,0.010568&t=h&z=17). Streetview (https://maps.google.com/maps?hl=en&ll=40.434559,-88.990977&spn=0.004745,0.010568&t=h&z=17&layer=c&cbll=40.434559,-88.990977&panoid=I63vZuz43C6H-ZlAjaI55Q&cbp=12,82.03,,0,-1.37).
Here's a SPUI without signals: IL-137 at Grand Avenue, Waukegan, Illinois (https://maps.google.com/maps?hl=en&ll=42.363633,-87.827926&spn=0.009212,0.021136&t=h&z=16). Streetview: Nbd exit ramp (https://maps.google.com/maps?hl=en&ll=42.363554,-87.828612&spn=0.009212,0.021136&t=h&z=16&layer=c&cbll=42.363626,-87.828529&panoid=GMsXTfcCatpsRa6c0zfBhg&cbp=12,326.38,,0,5.66).
The half-SPUI to the north is also controlled with stop signs (https://maps.google.com/maps?hl=en&ll=42.384336,-87.825608&spn=0.009209,0.021136&t=h&z=16&layer=c&cbll=42.384336,-87.825608&panoid=7eByj684479kGZnFfxJJTA&cbp=12,340.45,,0,3.11).
Quote from: US 41 on December 05, 2013, 09:59:12 AM
I was driving in Indy and realized that at I465 and Sam Jones Pkwy (former Airport Expressway) INDOT has put a diamond there.
What was wrong with the old interchange? http://www.in.gov/indot/images/MPA465_SamesJonesExpressway_2012.jpg
That's not the only place in Indy where it's gotten worse. INDOT has replaced cloverleafs with partial cloverleafs. I don't see how this is a upgrade. I don't think it's an upgrade if traffic has to stop where it didn't before. I know some are going to say it's to busy for a cloverleaf, but what I have to say is people need to quit being stupid, pay attention, and learn how to drive.
There are also other places where interchanges are getting "downgraded". I don't understand why DOT's want to stop traffic.
Quote from: getemngo on December 05, 2013, 01:47:11 PM
Trying to decide if I should use this thread as an opportunity to complain about SPUIs...
Well, SDDOT isn't. In fact, they're moving the other way (SPUIs for everyone!). I think about 1 interchange per year has been converted to a SPUI in the past few years, with one more in a couple years.
Quote from: hbelkins on December 05, 2013, 01:33:00 PM
Getting rid of weaving movements is a Good Thing.
H.B, you beat me to it. It isn't always an issue, but "full" cloverleafs often have problems with weaving (since the weave area is by definition pretty limited).
So removing some of the cloverleaf ramps and replacing them with signalized ramps (example here (https://maps.google.com/maps?q=silver+spring+md+20910&ll=39.013432,-77.041873&spn=0.004076,0.007929&hnear=Silver+Spring,+Maryland+20910&gl=us&t=h&z=17)) in Maryland, or doing other massive reconstruction (example here (https://maps.google.com/maps?q=bowie+md&hl=en&ll=38.955104,-76.717229&spn=0.016319,0.031714&sll=39.013432,-77.041873&sspn=0.004076,0.007929&t=h&gl=us&hnear=Bowie,+Prince+George%27s,+Maryland&z=15) (also Maryland)) or an almost equally massive retrofit while keeping the cloverleaf (example here (https://maps.google.com/maps?q=merrifield+va&hl=en&ll=38.865709,-77.220004&spn=0.00817,0.015857&sll=38.955104,-76.717229&sspn=0.016319,0.031714&t=h&gl=us&hnear=Merrifield,+Fairfax,+Virginia&z=16) in Virginia) does help.
Quote from: getemngo on December 05, 2013, 04:28:11 PM
But they're called Single Point Urban Interchanges. In urban areas, they're great.
I have also heard them referred to as Single Point
Diamond Interchanges as well. When PennDOT built it's first at the junction of US-22/PA-66 in Delmont (well over a decade ago now, holy shit...) they used that term a lot. That interchange also replaced a very tight cloverleaf.
I also seen them called Single Point Urban Diamond, but not that common. This one's abbreviation spells a real word.
New Jersey had one interchange that was changed to an at grade intersection. US 130 and NJ 33 in East Windsor had a directional interchange that was replaced with a signalized intersection.
Maryland replaced one interchange along the Bel Air Bypass of US 1 that was designed to be an interchange with stubs and dirt fills, but when it was extended to bypass Hickory the stubs were flattened and the road lowered to meet US 1 Business at grade.
US 1 & 9 and NJ 35 in Woodbridge was converted to a diamond from its original cloverleaf form, however I think that had to do with weaving issues.
FL 482 in Belle Isle, FL used to have a free flowing ramp that took motorists on to FL 528 EB from its eastern terminus before Boggy Creek Road was extended there. When Boggy Creek Road was built a signalized intersection not only was erected, but motorists that went from FL 482 EB to FL 528 EB in a directional interchange now have to enter the frontage road for FL 528 to access its ramp.
US 40 at OH 158 used to be a partial interchange. This was because it was for a few years the west end of a section of I-70. After more of I-70 was finished and this was no longer part of it, the interchange remained for a couple of decades before being downgraded.
WI 124 at WI 178 use to be grade separated. It's now a partial triple lane roundabout.
https://maps.google.com/?ll=44.920969,-91.379862&spn=0.00303,0.003449&t=h&z=18
Quote from: US 41 on December 05, 2013, 09:59:12 AM
I was driving in Indy and realized that at I465 and Sam Jones Pkwy (former Airport Expressway) INDOT has put a diamond there.
What was wrong with the old interchange? http://www.in.gov/indot/images/MPA465_SamesJonesExpressway_2012.jpg
That's not the only place in Indy where it's gotten worse. INDOT has replaced cloverleafs with partial cloverleafs. I don't see how this is a upgrade. I don't think it's an upgrade if traffic has to stop where it didn't before. I know some are going to say it's to busy for a cloverleaf, but what I have to say is people need to quit being stupid, pay attention, and learn how to drive.
There are also other places where interchanges are getting "downgraded". I don't understand why DOT's want to stop traffic.
The original interchange at Airport Expy./Sam Jones Expy. looked great on paper but it was not the safest one. The ramp from SB I-465 to EB Sam Jones was very tight. When the terminal moved, you were left with a road that ended a few hundred feet west of I-465 that no longer carried a high volume of traffic so I don't see how a very costly freeway to freeway interchange should have been justified there. Although I don't live down there, I think what they did makes very good sense. Money is limited, and other interchanges on I-465 needed costly improvements much more - some have been improved, and others (like I-465/I-69) are still waiting.
As for the cloverleaf topic, I lived near the I-65/US 30 interchange for years. US 30 is both a major intercity as well as a major local road so it has a lot of trucks and cars. As the area built up, the weaving became very dangerous and the original design definitely slowed down traffic. INDOT rebuilt the interchange about ten years ago so it is now a parclo (A4). Look at Google Maps (https://maps.google.com/?ll=41.47095,-87.324239&spn=0.004622,0.010568&t=h&z=17).
Note that the EB US 30 to NB I-65 loop ramp has been widened, and there are triple left turn lanes/double right turn lanes on to US 30. Also, the two loop ramps are separated from the mainline US 30 so they avoid the traffic lights. Although having two more lights is a pain, this is overall a much better design. I can't imagine how bad it would be if they had left it a full cloverleaf.
Also, two miles north, INDOT changed the 61st Avenue diamond interchange into another A4 parclo. I don't consider any of the INDOT interchanges changes (which have been many) to be downgrades. In the end, they are safer and can carry higher volumes of traffic.
The current cloverleaf at I-81 and NY 7 is going to be downgraded to some variant of diamond or folded diamond.
The US 71 & US 59 and I-30 interchange in Texarkana was a cloverleaf turned into a diamond, but a downgrade I would exactly not say so. All they did was eliminate the weaving that originally existed.
Now if you look at it for the signal aspect, it may be a downgrade cause you now have to wait at a signal instead of free flowing as you were for some time before. However, signals are being erected all throughout many states at typical intersections where for years we flowed smoothly and now have to stop for a minuet or two along our travel paths. So this is basically no different than that.
Quote from: roadman65 on December 06, 2013, 09:06:31 AM
Now if you look at it for the signal aspect, it may be a downgrade cause you now have to wait at a signal instead of free flowing as you were for some time before. However, signals are being erected all throughout many states at typical intersections where for years we flowed smoothly and now have to stop for a minuet or two along our travel paths. So this is basically no different than that.
That's true, but there are designs that reduce the likelihood of getting stopped at a red light. The most obvious example would be a one-way street. Signals along a one-way street can be timed to provide a wave of green lights for drivers (you may have to wait 1-minute at a traffic signal, but once you get your green you might drive through 50 green lights). Another design that improves signal progression is known as the superstreet. A superstreet essentially splits up a two-way road into two one-way streets making good 2-way signal progression possible. If you look at a parclo B4 interchange it looks a lot like a superstreet:
Superstreet in Troy, Michigan:(https://www.aaroads.com/forum/proxy.php?request=http%3A%2F%2Fi478.photobucket.com%2Falbums%2Frr144%2Ftradephoric%2FTransportation%2520Pictures%2FRandom%2FDallascomparison.jpg&hash=782c26ed28918b91f47019b216f5ad892ab9aa47)
Parclo B4 in Dallas, Texas:(https://www.aaroads.com/forum/proxy.php?request=http%3A%2F%2Fi478.photobucket.com%2Falbums%2Frr144%2Ftradephoric%2FTransportation%2520Pictures%2FRandom%2FDallasB4.jpg&hash=c626eea99f8ac9425ffba89bb3722f0c20dcb5c7)
Quote from: tradephoric on December 05, 2013, 11:21:40 AM
Quote from: US 41 on December 05, 2013, 09:59:12 AM
That's not the only place in Indy where it's gotten worse. INDOT has replaced cloverleafs with partial cloverleafs. I don't see how this is a upgrade. I don't think it's an upgrade if traffic has to stop where it didn't before. I know some are going to say it's to busy for a cloverleaf, but what I have to say is people need to quit being stupid, pay attention, and learn how to drive.
This might be an interesting thread to you. It describes the benefits of the parclo B4 partial cloverleaf design vs. the parclo A4 in respect to reducing driver delay. Out of curiosity, what design was selected in Indy when converting the full cloverleafs to partial cloverleafs?
https://www.aaroads.com/forum/index.php?topic=7967.msg182859#msg182859
Parclo A4 I think. The interchange I'm talking about is at US 40 / 465 on the west side of Indy.
Quote from: vtk on December 06, 2013, 11:22:52 AM
That's a B6, because it has six ramps. A B4 has only four ramps:
No, a B2 has four ramps.
https://www.aaroads.com/forum/index.php?topic=8127
Quote from: NE2 on December 06, 2013, 11:27:37 AM
Quote from: vtk on December 06, 2013, 11:22:52 AM
That's a B6, because it has six ramps. A B4 has only four ramps:
No, a B2 has four ramps.
https://www.aaroads.com/forum/index.php?topic=8127
I must have misremembered something. Point conceded.
Quote from: roadman65 on December 06, 2013, 09:06:31 AM
The US 71 & US 59 and I-30 interchange in Texarkana was a cloverleaf turned into a diamond, but a downgrade I would exactly not say so. All they did was eliminate the weaving that originally existed.
Now if you look at it for the signal aspect, it may be a downgrade cause you now have to wait at a signal instead of free flowing as you were for some time before. However, signals are being erected all throughout many states at typical intersections where for years we flowed smoothly and now have to stop for a minuet or two along our travel paths. So this is basically no different than that.
I would guess that the development of I-49 as a through route will take a lot of traffic out of that interchange.
Quote from: getemngo on December 05, 2013, 04:28:11 PM
Quote from: hbelkins on December 05, 2013, 03:47:40 PM
Actually, I don't have any problems with them. What do you dislike about them?
I don't hate SPUIs, and I do think they're really good for replacing diamonds in tight spaces with high traffic counts. It's also really fun to zip across all those lanes once the light turns green when you're exiting and turning left. :bigass: No second intersection!
But they're called Single Point Urban Interchanges. In urban areas, they're great. Where there's more space, I (like Tradephoric) would prefer a parclo.
The new interchange between the Natcher Parkway extension and Plano Road (KY 622) in Bowling Green, Ky., was built as a SPUI. It is right in the middle of what formerly was a corn field. I don't know if it was built in anticipation of development in that area or what, but I was surprised to see a SPUI in the middle of nowhere.
It isn't surprising they chose the parclo A4 as that seems to be the preferred type of parclo. Compare the time-distance diagram along US-40 for each type of parclo.
(https://www.aaroads.com/forum/proxy.php?request=http%3A%2F%2Fi478.photobucket.com%2Falbums%2Frr144%2Ftradephoric%2FTransportation%2520Pictures%2FRandom%2Funtitleda4_zps2c24ae11.jpg&hash=82b8607b2cab6cec7c07122795d1fb9259c89ee1)
(https://www.aaroads.com/forum/proxy.php?request=http%3A%2F%2Fi478.photobucket.com%2Falbums%2Frr144%2Ftradephoric%2FuntitledB4_zpsfe861916.jpg&hash=389152e9a73c976cc16cc105e4d113bd28120f57)
With a parclo B4 you can maintain good dual progression between High School Road and Morris Street as the ramp signals only stop one direction of travel (and can be easily coordinated to the upstream signal). With the parclo A4, the ramp signals stop both directions of travel and good progression deteriorates in at least one direction of travel.
Quote from: tradephoric on December 06, 2013, 10:30:31 AM
Quote from: roadman65 on December 06, 2013, 09:06:31 AM
Now if you look at it for the signal aspect, it may be a downgrade cause you now have to wait at a signal instead of free flowing as you were for some time before. However, signals are being erected all throughout many states at typical intersections where for years we flowed smoothly and now have to stop for a minuet or two along our travel paths. So this is basically no different than that.
Parclo B4 in Dallas, Texas:
(https://www.aaroads.com/forum/proxy.php?request=http%3A%2F%2Fi478.photobucket.com%2Falbums%2Frr144%2Ftradephoric%2FTransportation%2520Pictures%2FRandom%2FDallasB4.jpg&hash=c626eea99f8ac9425ffba89bb3722f0c20dcb5c7)
Ah yes, the current arrangement at US 75/Loop 12-Northwest Hwy. in Dallas. It was originally built as a full cloverleaf but was changed when US 75 was redone 1989-1999. I remember how surprised I was when it was changed, but I've come to accept it.
Quote from: roadman65 on December 06, 2013, 01:08:14 AM
US 1 & 9 and NJ 35 in Woodbridge was converted to a diamond from its original cloverleaf form, however I think that had to do with weaving issues.
It had to do with outdated interchange design - very tight loops, and NJ 35 briefly acted like a freeway between traffic lights - cars would speed up, hit the wider road in the underpass, and try to pass someone before the road narrowed again. Very dangerous in the case of NJ driving. Also keep in mind that the interchange was built in 1929, back when this was US 1 over US 9, the two most important north-south routes in the state. Now there's the Parkway and Turnpike, and the road underneath is just NJ 35, with US 9 also rerouted. There hasn't been a need for a cloverleaf here in at least 60 years.
Quote from: hbelkins on December 05, 2013, 01:33:00 PM
Getting rid of weaving movements is a Good Thing.
This, times a billion. Nothing frustrates me more than weave lanes when driving a vehicle that is 73 feet long and slow to accelerate and brake. Even when I'm not actually using that weave lane.
As has been hinted at, I think in most cases it's likely a result of progress in roadway design. There was a time when trying to provide a lot of free-flowing movements was considered cool, with out regards to the effects it had other than that it sped traffic up. A lot of old junctions involved tight loops, weaving, or some other design aspect that is in the modern day known to have a negative impact on safety. Since fixing the safety issue while keeping the interchange as "powerful" as it currently is is often not worth the cost and/or not possible given space constraints, "downgrading" the interchange often becomes the preferred alternative - because the interchange still does its job (albeit perhaps it causes some people to have to wait an extra 30 seconds), but it increases safety.
And in some cases (see the US 1&9/NJ 35 example), even from a traffic flow perspective the "downgrade" is an obvious improvement. Yes, the new interchange has a signal where the old one didn't. But it also has acceleration lanes, rather than blind curves ending at yield signs.
Near Columbus, OH, the (northern) interchange between arterial US-23 and I-270 is currently a full cloverleaf. A plan is underway remove two of the loops and make a signalized parclo.
http://www.dot.state.oh.us/projects/I-270/23/Pages/default.aspx (http://www.dot.state.oh.us/projects/I-270/23/Pages/default.aspx)
Quote from: lepidopteran on January 05, 2014, 12:13:45 AM
Near Columbus, OH, the (northern) interchange between arterial US-23 and I-270 is currently a full cloverleaf. A plan is underway remove two of the loops and make a signalized parclo.
http://www.dot.state.oh.us/projects/I-270/23/Pages/default.aspx (http://www.dot.state.oh.us/projects/I-270/23/Pages/default.aspx)
Weaving is a big problem there currently.
The US 60/ BUS I-40 (OLD US 66) Amarillo, Tx was downgraded to an intersection, due to traffic volumes declining due to I-40 being built.
Quotehttps://maps.google.com/?ll=35.252348,-101.645744&spn=0.012406,0.024912&t=h&z=16
Also, in Dallas, there was a flyover NB SH 310 (OLD US 75) at Illinois Av (FMR SH 246). It's now a flat intersection.
Quotehttps://maps.google.com/?ll=32.711433,-96.75391&spn=0.006391,0.012456&t=h&z=17
In Miami Beach, FL, there used to be a single flyover ramp from W. 63rd St. to NB A1A (Indian Creek Dr. along the Intracoastal, as opposed to Collins Ave. along the beach which at that point is NB only.) The structure was all concrete IIRC, and was held up by sleek V-like piers. Since the ramp was one-movement-only, there were flashing red lights at the ramp's exit on A1A. Not completely sure why it was demolished, but I suspect that maintenance issues were at least partly to blame. Anyone know for sure?
Quote from: lepidopteran on January 05, 2014, 02:03:48 AM
In Miami Beach, FL, there used to be a single flyover ramp from W. 63rd St. to NB A1A (Indian Creek Dr. along the Intracoastal, as opposed to Collins Ave. along the beach which at that point is NB only.) The structure was all concrete IIRC, and was held up by sleek V-like piers. Since the ramp was one-movement-only, there were flashing red lights at the ramp's exit on A1A. Not completely sure why it was demolished, but I suspect that maintenance issues were at least partly to blame. Anyone know for sure?
It seems to have been a combination of outdated design (including low clearance underneath) and locals' desire to tear it down to piss off CP Zilliacus.