'Shortest' interstate off ramp

[papakilz]

I thought I read once that Exit 339 on northbound I 75 in Mackinaw City, MI is the 'shortest' off ramp in the interstate system.  There is a gradual slow down lane which ends with a 90 degree turn to a STOP SIGN!  Any clue as to whether or not it truly is the shortest off ramp or not?

[sbeaver44]

That is pretty short.  I immediately thought of the Grimes Exit (15) from I-78 in Pennsylvania:

US-22 & I-78 & Frantz Rd, Bethel, PA 19507

https://goo.gl/maps/Y8rtue21sJS2

Nexus 6P

[Rothman]

Not checking Google Maps, I think of I-68 WB at Maryland Ave in Cumberland, MD

[RobbieL2415]

I think many offramps in NYC qualify.

[jp the roadgeek]

I-95 Exit 51 for US 1 in New Haven/East Haven both directions

Northbound (long exit lane, but here's the ramp, which hilariously spans 2 municipalities and even has an exit tab similar to those of the GSP)

https://goo.gl/maps/VuYMSU9fTK52

Southbound (same deal with the exit lane)

https://goo.gl/maps/AZayMRs2YrA2

[amroad17]

I agree with sbeaver44 because the southbound ramps are a bit longer than any of the ramps at Exit 15 on I-78.  Also some of the I-85 in SC ramps between Spatanburg and the NC/SC state line could qualify.  They have a similarity to the Exit 51 ramps described above.

[ukfan758]

65 South exit 134, Arthur St. What's incredibly short though is the onramp.

https://www.google.com/maps/@38.2226292,-85.7511982,17z/data=!3m1!1e3?hl=en

[amroad17]

^ The very definition of a "slip ramp".

[Rothman]

I was also thinking about the ramps in the cave on I-90/I-94 in Chicago, especially before the express lanes were added.

[MikeTheActuary]

I think a problem with trivia such as this is that you'd need a very precise definition of "exit ramp" - e.g. where does the deceleration lane end and the ramp begin?

I think the Mackinaw City ramps listed above probably do win the prize of most dramatic exit ramp of those listed above (note the 15 mph advisory speed and the stop sign that's arguably within the I-75 right-of-way), but depending on how you define "ramp", perhaps I-87 NB Exit 14 in Yonkers (https://goo.gl/ZQ9uwh) is a contender.

[Brandon]

I thought I read once that Exit 339 on northbound I 75 in Mackinaw City, MI is the 'shortest' off ramp in the interstate system.  There is a gradual slow down lane which ends with a 90 degree turn to a STOP SIGN!  Any clue as to whether or not it truly is the shortest off ramp or not?

Here's the Mackinaw City ramps in question: https://goo.gl/maps/bvsxnTgSCTT2
Streetview: https://goo.gl/maps/MVPk5pZiaVt

For difficult entry ramps, here's one that'll be on the tour on Saturday: https://goo.gl/maps/hog78HffUB92

[mgk920]

There is essentially a 'RIRO' intersection on WB I-80 along the Delaware River in New Jersey.

Also, there are numerous 'RIRO' access interchanges along rural interstates in Wyoming.

Mike

[michravera]

I thought I read once that Exit 339 on northbound I 75 in Mackinaw City, MI is the 'shortest' off ramp in the interstate system.  There is a gradual slow down lane which ends with a 90 degree turn to a STOP SIGN!  Any clue as to whether or not it truly is the shortest off ramp or not?

I am pretty sure that most of them have been fixed, but LA (and most of what eventually became CASR-99) was famous for entrance ramps effectively being "holes in the fence with a 'FREEWAY ENTRANCE' sign". A number of exit ramps on CASR-99 north of Madera (some in San Joaquin and Sacramento Counties come to mind) are still like that now. CASR-99 is not an interstate, but I am fairly sure that not all of the I-5, I-405, and I-110 entrances in LA have been fully upgraded.

As for exit ramps, a number of exits from I-35 in Austin (and probably the rest of Texas as well) dump you almost immediately onto a frontage road. A lot of those have an extra lane for a little while but often not very. Now, the frontage road is often identified and being part of I-35, so there is a definitional question of whether you have truly "exited" I-35.

[inkyatari]

Scroll a little further north from the Mackinaw City ramp, and you can see that the state of Michigan built the visitor center for Fort Michilmackinac State Park under the Mackinack Bridge..

https://www.google.com/maps/@45.7877681,-84.7320283,20z/data=!3m1!1e3

[ekt8750]

Any ramp off or on the Schuylkill Expressway

[WillWeaverRVA]

The offramp for Exit 74B on southbound I-95 in Richmond, VA is a little over 300 feet long. It regularly backs up onto the freeway. Just one of many substandard parts of this segment of I-95.

[cpzilliacus]

I-70/U.S. 40 eastbound  at Missouri Exit 37A (GSV or satellite view) near Odessa has a fairly long deceleration lane, but it ends in a 90° right turn which leads almost immediately to a STOP sign or YIELD sign at a frontage road running next to the eastbound lanes of I-70.

[cpzilliacus]

Not checking Google Maps, I think of I-68 WB at Maryland Ave in Cumberland, MD

Agree that the exit on the westbound side is bad. 

Though it might be worse on the eastbound side.

These exits are now part of I-68, but were built as part of the Cumberland Thruway, a section of non-Interstate U.S. 40.

There's a watermarked 1966 image of the Cumberland Thruway's bridge over Wills Creek and adjacent elevated highway under construction from the Baltimore Sun online here.

[Mr_Northside]

That is pretty short.  I immediately thought of the Grimes Exit (15) from I-78 in Pennsylvania:

US-22 & I-78 & Frantz Rd, Bethel, PA 19507

https://goo.gl/maps/Y8rtue21sJS2
Nexus 6P

I-70's exit with PA-643 @ Town Hill might be a hair shorter....

[sbeaver44]

That is pretty short.  I immediately thought of the Grimes Exit (15) from I-78 in Pennsylvania:

US-22 & I-78 & Frantz Rd, Bethel, PA 19507

https://goo.gl/maps/Y8rtue21sJS2
Nexus 6P

I-70's exit with PA-643 @ Town Hill might be a hair shorter....

You could be right.  That section of 70 is weird.

Nexus 6P

[cpzilliacus]

I-70's exit with PA-643 @ Town Hill might be a hair shorter....

You could be right.  That section of 70 is weird.

Because Pennsylvania.  Though between I-79 at Washington, Pennsylvania and New Stanton is probably worse, though between Breezewood and the Maryland border is pretty bad too (and as a bonus, has a posted 55 MPH speed limit and predatory PSP speed limit enforcement).

[Sykotyk]

https://www.google.com/maps/place/Columbia,+NJ+07832/@40.9400559,-75.1050209,160m/data=!3m1!1e3!4m5!3m4!1s0x89c47dbd6a8d7d77:0x14031690885deb3b!8m2!3d40.9256446!4d-75.0931123

This spot in Columbia, NJ is probably the worst. Only westbound, but it's essentially a RIRO as mentioned above. What's worse, there's a truck stop that exits westbound trucks onto the highway at this interchange. Not safe at all.

[csw]

I-25 NB North of Pueblo, CO. Not as short as some others posted, but still pretty dramatic and unique for the area.

https://www.google.com/maps/@38.1148154,-104.6733104,532m/data=!3m1!1e3

[jeffandnicole]

Not Interstate, but close enough.  Exit 14 - Creek Road - Off of Rt. 42 in NJ.

https://goo.gl/maps/FukihMfHoTM2

[plain]

I-70/U.S. 40 eastbound  at Missouri Exit 37A (GSV or satellite view) near Odessa has a fairly long deceleration lane, but it ends in a 90° right turn which leads almost immediately to a STOP sign or YIELD sign at a frontage road running next to the eastbound lanes of I-70.

That's one of the craziest setups I've seen in a minute. And I hope that area doesn't have drunk drivers smh I'd hate to see them try to use that ramp. Also that's a very interesting BGS for that exit.