Longest ramps/interchanges?

[Rothman]

Did anyone bring up that bridge that's part of the Mixing Bowl (I-95/I-495/I-395)?  At least when I toured the site when it was being constructed, it was touted as one of the longest bridges in the country that did not cross water.

It may not have been brought up because technically the bridge you're referring to is not a ramp.  It's the I-95 mainline.

Go figure.

[Brandon]

Of course, there is the extended I-88/I-355 interchange.  While the ramps aren't as long as some, the interchange itself is as it is strung out over 2 miles.

https://goo.gl/maps/xxo3Hex22yL2

[lepidopteran]

At the southern/western terminus of I-675 at I-75 in Miamisburg, OH, the ramps going to SB and from NB I-75 seem quite long.

[PHLBOS]

The ramp from I-395 South to I-95 North in Baltimore is fairly long (and also fairly high).

[Pete from Boston]

Exit 15x on the NJTP near Secaucus transfer is a very long ramp.

First one I thought of.  Something like a mile and a half long.  Seems like putting in a toll booth, crossing the railroad tracks, and turning 180° required a lot of room. 

[kkt]

The San Bruno I-380 eastbound to SFO entrance, parallels US 101 for a mile or so.

[TheStranger]

The San Bruno I-380 eastbound to SFO entrance, parallels US 101 for a mile or so.

Along with a parallel elevated ramp northbound connecting the SFO terminal road to 380 west!

[roadman65]

The NB exit for NJ 17 in Mahwah, NJ is relatively long.  You have to travel up and around and over the road you are exiting to and it extends for probably about a half a mile before it loops around and crosses I-287 itself before merging into the opposite direction's carriageway.  Then you got to use I-287 SB for a quarter mile to exit again for NJ 17 proper.

Adding the long u turn ramp and the time you spend on I-287 SB just to get to NJ 17 would constitute a long ramp IMO.

[2Co5_14]

The ramp from I-285 EB to I-75 NB on the northwest perimeter of Atlanta is almost 2 miles long
The ramp from I-285 WB to I-75 SB on the southern perimeter of Atlanta is a little over 2 miles long
(Both of these are including the portion of the C-D road that parallels I-285).

[Pete from Boston]

The NB exit for NJ 17 in Mahwah, NJ is relatively long.  You have to travel up and around and over the road you are exiting to and it extends for probably about a half a mile before it loops around and crosses I-287 itself before merging into the opposite direction's carriageway.  Then you got to use I-287 SB for a quarter mile to exit again for NJ 17 proper.

Adding the long u turn ramp and the time you spend on I-287 SB just to get to NJ 17 would constitute a long ramp IMO.

You're on 17 and 287 at that point.  As you no doubt recall, this was 17 when this leg of 287 was still just a fiction unlikely to ever get built.

[roadman65]

The NB exit for NJ 17 in Mahwah, NJ is relatively long.  You have to travel up and around and over the road you are exiting to and it extends for probably about a half a mile before it loops around and crosses I-287 itself before merging into the opposite direction's carriageway.  Then you got to use I-287 SB for a quarter mile to exit again for NJ 17 proper.

Adding the long u turn ramp and the time you spend on I-287 SB just to get to NJ 17 would constitute a long ramp IMO.

You're on 17 and 287 at that point.  As you no doubt recall, this was 17 when this leg of 287 was still just a fiction unlikely to ever get built.

What is that got to do with ramp?  You still have a long way to go when you diverge from NB 287 to when you finally leave the freeway which is the SB Left exit ramp.  Whether you are on NJ 17 the moment you merge into the SB 287 lanes still constitutes actual freeway driving.  Yes its not a ramp at that point, as NB you actually use one long ramp into the opposite direction travel where even after NJ 17 splits its not really a ramp because its the highway proper.  However, its still a long journey and the ramp to u turn is a long one (longer than the traditional lengths anyway) in itself.

[Pete from Boston]

Are you talking about from 287 NB or the Thruway NB?  You never did say.

[signalman]

I believe that he was making reference to the NB 287 U-turn ramp from 287 NB to 17 SB.  I had forgotten about that ramp, but I do agree that it is quite long. Similarly, one must utilize that U-turn ramp to go from 17 NB to 287 SB.  While it may technically be NJ 17, it feels like a ramp, save for the RIRO driveway to Sharp Plaza.

[PHLBOS]

The I-84/691 interchange near Southington, CT has some rather long ramps; the I-691 West to I-84 West ramp and I-84 West to I-691 East ramp in particular.

[Pete from Boston]

It's well over a mile between when one exits 84 going west at Exit 59 and when one is legitimately on 384 (which I'm counting as once you're across 84 and actually going east).

[freebrickproductions]

A couple of the ramps at the I-565/US 231 & US 431 interchange are about a mile long:
https://www.google.com/maps/@34.7372097,-86.5917067,15z/data=!3m1!1e3

Not the longest out there, but I believe that they are the longest here in Huntsville.

[cl94]

There's one in Albany that is 1.3 miles long and another that may or may not be 1.6 miles depending on how you classify it. Thruway Exit 26 (I-890 western terminus) has one spending up to 1.5 miles on a ramp without using NY 890. That goes up to over 2 if you count NY 890 as a long ramp (which it basically is).

The ramp connecting I-684 and the Hutch is 1.3 miles as well.

[Pete from Boston]

Google Maps shows that ramp as the 684 mainline.  Is that not the case?

[cl94]

Google Maps shows that ramp as the 684 mainline.  Is that not the case?

Not according to Wikipedia or reference markers. NY 984J. According to reference markers, the mainline defaults onto EB I-287

[vtk]

Northeast side of Columbus: ramp from I-270 northbound to OH 161 eastbound, 4.6 miles; ramp from OH 161 westbound to I-270 southbound, 4.9 miles. Measure from where the traffic flow splits from one route's mainline lanes to where it joins the other's mainline lanes.

[TheHighwayMan3561]

Minnesota's longest ramp that I can think of is the ramp from northbound MN 15 to eastbound I-94 near St. Cloud. It's about 1.2 miles from exit to merging onto the 94 mainline, which also includes merging into the C/D lane for a stretch before entering the mainline.

[realjd]

The interchange between I-465 and I-70 near the Indianapolis airport has what would probably classify as unusually long ramps. From I-465 SB to Ronald Reagan Parkway SB is about 5 miles, all without entering mainline I-70.

https://www.google.com/maps/dir/39.7206541,-86.2647371/39.6845609,-86.3289052/@39.7023574,-86.3208499,13.75z/data=!4m2!4m1!3e0

[shadyjay]

Honorable mention goes to CT 9 Exit 7.  It's about 3 miles long and there is literally "nothing" along that 3-mile stretch between CT 9 and CT 154.  It's signed as CT 82 and could be considered a "super 3" limited access highway.  But there is NOTHING on that stretch.   

For all intensive purposes, it's a 3-mile long exit ramp.

https://www.google.com/maps/@41.4314658,-72.4843848,15z

[hotdogPi]

For all intensive purposes, it's a 3-mile long exit ramp.

See here for why it's not.

[noelbotevera]

I-635 between exit 19 and exit 27. It literally is just a glorified exit ramp, those submerged lanes are, that run from US 75 to I-35E. 8 miles long.