Nicest cloverleaf?

[pianocello]

This is one of my favorites, at least as far as cloverleaves go. It's also (almost) perfectly symmetric. (US-61 at I-80, Davenport)

[Some_Person]

Theres a construction project starting to make it into a parclo, which'll be a good improvement.

Nah, it should be a SPUI. That, and the interchange with PA 987 to the east, and with PA 100 to the west of the merge with 78.

Yeah, I agree, on the 145 interchange a cloverleaf is basically unnecessary, as there was barely any room to fit one in, and 145 is not exactly an expressway, so any other interchange such as an SPUI like what you said could work. However, these are already the plans : http://www.145-22int.com/documents/final%20conditions%20-%20revised.pdf

Ramp B in that map has a yield sign normally, but always has people stopped bumper to bumper behind it as there is no acceleration lane and therefore almost never enough time to accelerate to 50-60 (limit is 55) and merge into traffic while you have people slowing to access 145 north, so this project seems like it could be a good improvement.

Not trying to be too off topic though, I think the Interstate 95/US 64 cloverleaf looks very nice as well: http://goo.gl/maps/CtJx9
This one south of there, with 95 and NC 24 looks almost completely symmetrical: http://goo.gl/maps/ZecPK

[The High Plains Traveler]

Well, if symmetry is the guide than this is the finest cloverleaf ever. It was built in the mid-1960s and is now a menace 18-20 hours a day. I-494/35W. The fix to this includes maybe one N-W directional ramp as well as an extremely wide W-S loop bisected by the S-W ramp.

[flowmotion]

Well, if symmetry is the guide than this is the finest cloverleaf ever. It was built in the mid-1960s and is now a menace 18-20 hours a day. I-494/35W.

FYI, this link is broken unless you have some plugin installed. But despite the supposed perfectitude, the  I-494/35W junction is objectively terrible. Rural-style cloverleaf on a major urban freeway junction? Grit your teeth because MnDOT is mumbling something about snowplows.

A great  thread topic would be the "worst cloverleaf". Like the smallest, most brain-damaged deformed loop-ramp thing that benzoed-up 1950s traffic engineers could have conceptualized. Unfortunately, all the examples I could think of have been removed.

[mcdonaat]

Unfortunately, all the examples I could think of have been removed.

...including the cloverleaf at US 61/US 190? http://goo.gl/maps/xtaLt
It's weird, you have three interchanges in a row... Airline at Scenic, Airline at I-110, and Airline at Plank.

[algorerhythms]

Unfortunately, all the examples I could think of have been removed.

...including the cloverleaf at US 61/US 190? http://goo.gl/maps/xtaLt
It's weird, you have three interchanges in a row... Airline at Scenic, Airline at I-110, and Airline at Plank.

Exit: 10 MPH

[kphoger]

Another worst:  I-235 at Kellogg here in Wichita.  Eventually they'll rebuild it.

[mcdonaat]

Unfortunately, all the examples I could think of have been removed.

...including the cloverleaf at US 61/US 190? http://goo.gl/maps/xtaLt
It's weird, you have three interchanges in a row... Airline at Scenic, Airline at I-110, and Airline at Plank.

Exit: 10 MPH

And that's a solid 10. I tried to navigate the exit at 15 MPH, almost left the roadway. It's almost like a compressed cloverleaf, and the first cloverleaf period in the state of Louisiana.

[Roadsguy]

Looks like there used to be a slip ramp at the northwest quadrant from Monte Sano Ave.

That's a super-obvious candidate for at least a diamond, probably a SPUI.

[Alps]

Best or worst, depending on how you like to think of it:
https://maps.google.com/?ll=42.299699,-83.271486&spn=0.00396,0.008808&t=k&z=17

[intelati49]

Best or worst, depending on how you like to think of it:
https://maps.google.com/?ll=42.299699,-83.271486&spn=0.00396,0.008808&t=k&z=17

God damn that's tight. (and not in a good way)

[Ga293]

I'm a big fan of this one in Homewood, Alabama.

https://maps.google.com/?ll=33.468268,-86.777974&spn=0.005499,0.008256&t=h&z=18

Probably functionally obsolete, but it's pretty and still better than having a traffic light at that intersection.

[cpzilliacus]

I'm a big fan of this one in Homewood, Alabama.

https://maps.google.com/?ll=33.468268,-86.777974&spn=0.005499,0.008256&t=h&z=18

Probably functionally obsolete, but it's pretty and still better than having a traffic light at that intersection.

Your mention of the phrase functionally obsolete reminded me of a cloverleaf in Emporia, Virginia, where U.S. 58 crosses I-95 (I-95 Exit 11 in Virginia) which has probably been  made obsolete (and crash-prone) because of heavy truck traffic exiting and entering I-95 here.

[NE2]

Best or worst, depending on how you like to think of it:
https://maps.google.com/?ll=42.299699,-83.271486&spn=0.00396,0.008808&t=k&z=17

God damn that's tight. (and not in a good way)

Since it's Michigan, they could remove the loops with no loss of access.

[agentsteel53]

I'm a big fan of this one in Homewood, Alabama.

https://maps.google.com/?ll=33.468268,-86.777974&spn=0.005499,0.008256&t=h&z=18

Probably functionally obsolete, but it's pretty and still better than having a traffic light at that intersection.

a similar one in Greenwood, MS.

http://goo.gl/maps/Mq9La

I think the Greenwood is bigger, though.

[cpzilliacus]

Two along I-95 in Maryland:

I-95 at Md. 212 (Powder Mill Road) (Exit 29) in Prince George's County.  Not at all symmetric, and the northbound side of I-95 has a C-D lane (which now extends north to the Md. 200 interchange).

I-95 at Md. 216 (Exit 35) in Howard County.  Note how the ramp from southbound I-95 to westbound Md. 216 was modified to slow exiting traffic (not sure why that was needed).

And far to the south, in South Carolina (near Holly Hill), but still I-95:

I-95 at I-26 (I-95 Exit 86) in Orangeburg County.  Curiously, even though I-26 is (in theory) an east-west Interstate, it runs more N-S here than I-95 does.

[Alps]

Best or worst, depending on how you like to think of it:
https://maps.google.com/?ll=42.299699,-83.271486&spn=0.00396,0.008808&t=k&z=17

God damn that's tight. (and not in a good way)

Giggity.


Giggity.
Goo.

[yakra]

Best or worst, depending on how you like to think of it:
https://maps.google.com/?ll=42.299699,-83.271486&spn=0.00396,0.008808&t=k&z=17

God damn that's tight. (and not in a good way)

Giggity.


Giggity.
Goo.

TOIGHT LIKE A TOIGER!

Since it's Michigan, they could remove the loops with no loss of access.

Indeed. I see some Michigan lefts right there... Maybe it'd be too much traffic to funnel thru there, or too short a distance to weave across 4 lanes. Though ya could use the next M-Left about .2 mi farther on. I dunno man I didn't do it.
But the turns on those loop ramps are wicked shaahp bub!

[Ian]

Best or worst, depending on how you like to think of it:
https://maps.google.com/?ll=42.299699,-83.271486&spn=0.00396,0.008808&t=k&z=17

God damn that's tight. (and not in a good way)

This one's also fairly tight:
http://goo.gl/maps/LQV4d

[intelati49]

Best or worst, depending on how you like to think of it:
https://maps.google.com/?ll=42.299699,-83.271486&spn=0.00396,0.008808&t=k&z=17

God damn that's tight. (and not in a good way)

This one's also fairly tight:
http://goo.gl/maps/LQV4d

The first one's the worst. All the ramps have the same radius.

[mgk920]

Howabout this one?

http://goo.gl/maps/XbJLG



Mike

[colinstu]

Howabout this one?

http://goo.gl/maps/XbJLG



Mike

that's ridiculous.

I feel bad for the person who wants to turn left. They have to stop at the intersection, go forward through the loop, and end up at another stop light.

[NE2]

Santa Clara County still has at least one with the right turns inside the (two-way surface street) loops, though none of the right turns are signed for use: https://maps.google.com/?ll=37.274966,-121.878746&spn=0.005506,0.008256&t=k&z=18
Weaving ahoy. At others the direct right turns have been removed.

[Ian]

Another tight cloverleaf (if you want to call it a real cloverleaf, that is):
http://goo.gl/maps/ZDfnj

[Scott5114]

I like how the "nicest cloverleaf" thread degenerated into the "nastiest cloverleaf" thread. I suppose that's just a function of cloverleaves!