Left-exit cloverleaf ramps

[TheStranger]

Since cloverleaf ramps are usually used to allow traffic to exit right and merge from the right in what otherwise would be a left-turning movement, I thought this example at the East Los Angeles Interchange (I-5/Golden State Freeway north Exit 134C to East 7th Street) was rather notable:

https://maps.google.com/maps?q=E+7th+St+%26+S+Boyle+Ave,+East+Los+Angeles,+CA&hl=en&ll=34.033395,-118.219441&spn=0.005118,0.004774&sll=34.033014,-118.218926&sspn=0.005118,0.004774&t=h&hnear=E+7th+St+%26+S+Boyle+Ave,+Los+Angeles,+California+90023&z=18

It appears to be an adaptation of what was the original 1940s offramp from US 101/Santa Ana Freeway to 7th:

http://www.historicaerials.com/aerials.php?scale=8E-06&lat=34.0332010863852&lon=-118.22008611257&year=1948

though it seems that creating a full RIRO (instead of just an onramp) at East 7th and South Breed Street would have been an easier, more conventional option when the full East Los Angeles Interchange came to fruition.

Any other examples of this?

[agentsteel53]

I would like to see a left-exit, left-entrance, counterclockwise-rotating clover... in a right-side-drive country. 

in fact, any counterclockwise-rotating clover would be interesting. 

[1995hoo]

I would like to see a left-exit, left-entrance, counterclockwise-rotating clover... in a right-side-drive country. 

in fact, any counterclockwise-rotating clover would be interesting. 

Can it be a single anticlockwise loop-around ramp without being part of a full cloverleaf? If so, there's one in Delaware: http://goo.gl/maps/PqRIz

Also, one of the new ramps connecting the Capital Beltway and the reversible HOV facility on Shirley Highway in Springfield, Virginia, operates as a left-exit, left-entrance anticlockwise loop-around for at least certain maneuvers at certain times of day. It's a reversible ramp, of course, so it's not always like that.

[TheStranger]

I would like to see a left-exit, left-entrance, counterclockwise-rotating clover... in a right-side-drive country. 

in fact, any counterclockwise-rotating clover would be interesting. 

Can it be a single anticlockwise loop-around ramp without being part of a full cloverleaf? If so, there's one in Delaware: http://goo.gl/maps/PqRIz

That would be the prototypical example!  Left movement as a substitute for a basic right-turn ramp...which is odd as there seems to be enough right of way for one.

[froggie]

A lot of the acreage surrounding that Delaware example is wetland.

IIRC, Boston has something similar on the ramp from EB 90 to SB 93 as well as from NB 93 to the Tobin Bridge.

[agentsteel53]

That would be the prototypical example!  Left movement as a substitute for a basic right-turn ramp...which is odd as there seems to be enough right of way for one.

I get the idea the water has something to do with it.

[jeffandnicole]

Back in the day, that water probably wasn't a big deal. The entire I-95 mainline is built thru a marsh or over streams/rivers in that area for several miles.

[NE2]

It's because the I-295 split is right the fuck there.

[1995hoo]

It's because the I-295 split is right the fuck there.

The ramp still could have been built on the right had they wished. It just would have merged into I-95 on the left, same as it does under the existing configuration. Presuming the ramp from the other direction would have remained as is, it would have meant either having two acceleration lanes or else separating the acceleration lane for the other ramp, having the theoretical right-side ramp join that, and then having that single merged lane join I-95 on the left.

If you look at the left-side exit from southbound I-295 onto Route 141 just above there on the map, picture a mirror-image of that ramp going from 141 onto northbound I-95. That's kind of what I'm envisioning as the alternative.

[jeffandnicole]

They could've designed it so the ramp goes in the middle of the split.

[signalman]

The ramp still could have been built on the right had they wished. It just would have merged into I-95 on the left, same as it does under the existing configuration. Presuming the ramp from the other direction would have remained as is, it would have meant either having two acceleration lanes or else separating the acceleration lane for the other ramp, having the theoretical right-side ramp join that, and then having that single merged lane join I-95 on the left.

True, it could have.  However, personally I've always liked this design.  Even though I don't like left entrances onto an interstate, I've always thought it was an innovative and clever way to facilitate the movements from both directions of DE 141 to I-95 NB.
Edit to post an after thought:
Perhaps the ramp(s) were designed in order to minimize the amount of land that had to be filled.  I know the whole I-95, 295, 495, DE 141 megachange is on wetlands.  I'm not really sure if replacing wetlands that were filled in was something that was done when this was designed/built.  But if they were, perhaps the ramp configuration was chosen in order to minimize what had to be filled in and then replaced.

[1995hoo]

Yeah, I think it's fine too; I was just responding to NE2's comment about the I-95/295 split being right there (for whatever reason, he apparently found it offensive that someone didn't consider that).

[jeffandnicole]

The biggest problem with the design is coming from 202 South, one enters the left side ramp then must come to an immediate yield, looking back to see if traffic is on the loop.  Many accidents have occurred due to this condition, as there's no merge lane available.

[Alex4897]

Can it be a single anticlockwise loop-around ramp without being part of a full cloverleaf? If so, there's one in Delaware: http://goo.gl/maps/PqRIz

Beat me to it. 

[Alps]

I-94 at Telegraph Rd. in Detroit used to have an inside double-trumpet with left exits/entrances. I miss that.

[NE2]

I-94 at Telegraph Rd. in Detroit used to have an inside double-trumpet with left exits/entrances. I miss that.

SC 31 at US 501 has an exact mirror image of it. But the loops in both are the correct (clockwise) direction - they just merge/split on the left.

[Brandon]

I-94 at Telegraph Rd. in Detroit used to have an inside double-trumpet with left exits/entrances. I miss that.

However, it did not contain left-exit cloverleaf ramps.  All ramps exited and entered Telegraph from the right.  Ditto with US-12 at I-94 in New Buffalo (Exit 4).  One of the ramps leaves wbd US-12 to ebd I-94 from the right of US-12 and enters on the left of I-94 in a similar fashion as the former ramps at Telegraph and I-94 (Exit 202).

[dgolub]

On Long Island, the interchanges of the Southern Parkway with the Meadowbrook Parkway and the Wantagh Parkway would seem to qualify.

http://goo.gl/maps/EVDb3
http://goo.gl/maps/6z5Kb

[Kacie Jane]

There are left exits, but the left exits aren't cloverleaf ramps.

[Revive 755]

Although technically not an exit, the I-270/MO 100 interchange in Des Peres, MO, has a left sided loop ramp.  It used to be a more standard right side loop until the new lanes for WB MO 100 opened.

https://maps.google.com/maps?q=des+peres,+mo&hl=en&ll=38.60326,-90.449109&spn=0.005271,0.008256&sll=42.032432,-88.091192&sspn=0.226702,0.528374&hnear=Des+Peres,+St+Louis,+Missouri&t=k&z=18

[roadman65]

The biggest problem with the design is coming from 202 South, one enters the left side ramp then must come to an immediate yield, looking back to see if traffic is on the loop.  Many accidents have occurred due to this condition, as there's no merge lane available.

It is a cool design despite its flaws.  True like 1995 said, it would be better if it were to the right of DE 141 to merge into the center of I-95, but being that the configuration is there it is kind of a blessing in disguise.  Having something different and out of the ordinary is good for a change.  Probably the best way to avoid the blind merge, would be to add a lane to the ramp and extend both lanes into the primary merge with I-95 where it then would drop to one and then finally none even at making the whole merge area on the freeway longer.

[pianocello]

Looks like the ramp from EB I-94 to SB US-52 in St. Paul, MN fits the OP.
http://goo.gl/maps/W09kC

[roadman65]

This is not one as far as the topic goes, but it is similar as even as a right hand exit it loops around on the left.  The PA 581 and US 11 interchange near Camp Hill, PA (the S-W end of the two route concurrency) has  EB PA 581 ramp to US 11 SB exit to the right and then cross to the left side of the freeway to merge with the SB exit to US 11 SB and make a loop and return to the right side again.
https://maps.google.com/maps?q=Camp+Hill,+PA&hl=en&ll=40.243076,-76.980686&spn=0.009058,0.019741&sll=27.698638,-83.804601&sspn=10.745619,20.214844&oq=camp+h&t=h&hnear=Camp+Hill,+Cumberland,+Pennsylvania&z=16

[Alps]

I-94 at Telegraph Rd. in Detroit used to have an inside double-trumpet with left exits/entrances. I miss that.

However, it did not contain left-exit cloverleaf ramps.  All ramps exited and entered Telegraph from the right.  Ditto with US-12 at I-94 in New Buffalo (Exit 4).  One of the ramps leaves wbd US-12 to ebd I-94 from the right of US-12 and enters on the left of I-94 in a similar fashion as the former ramps at Telegraph and I-94 (Exit 202).

It did contain left-exit cloverleaf ramps. It did not contain ramps that were both left-exit AND left-entrance.

[elsmere241]

The biggest problem with the design is coming from 202 South, one enters the left side ramp then must come to an immediate yield, looking back to see if traffic is on the loop.  Many accidents have occurred due to this condition, as there's no merge lane available.

It is a cool design despite its flaws.  True like 1995 said, it would be better if it were to the right of DE 141 to merge into the center of I-95, but being that the configuration is there it is kind of a blessing in disguise.  Having something different and out of the ordinary is good for a change.  Probably the best way to avoid the blind merge, would be to add a lane to the ramp and extend both lanes into the primary merge with I-95 where it then would drop to one and then finally none even at making the whole merge area on the freeway longer.

DelDOT is working on that: http://deldot.gov/information/projects/i95/sr141-i95/index.shtml

The first priority will be to add that lane.