Closest duplicate 3-dis

[OCGuy81]

What's the least distance you'd need to travel on a parent route to find the next instance of the same 3-di?

Examples: On I-5, there's about 160 miles from the northern terminus of I-405 (OR) until I-405 (WA)

On I-10, there's about 110 miles between I-110 (MS) and I-110 (FL)

I feel there will be closer instances in the east.

to be fair, beltways or continuous routes don't count. These need to be separate routes, sorry I-495.

[Roadgeekteen]

I-291's in Hartford and Springfield about 22 miles apart. I-470's in Topeka and KC also close.

[cwf1701]

I-475 Toledo/Flint approx 120 Miles

[oscar]

The I-395s in VA/DC and MD are about 60 miles apart via I-95.

The I-695s in DC and MD are even closer as the crow flies, but the one in DC doesn't directly connect to I-95 (you would need to take I-395, I-295, or DC/MD 295 to get to I-95).

[sprjus4]

VA I-295 and MD I-295 are about 93 miles apart.

VA I-295 and NC I-295 are about 170 miles apart.

[Hwy 61 Revisited]

MD-DC I-295 and DE-NJ-PA I-295 are ~99 mi apart as the crow--rather, raven--flies.

[Konza]

How about the I-470s in Topeka and Kansas City?

Looks to be about 68 miles, even less as the crow flies.

[sprjus4]

I-470's in Topeka and KC also close.

[Roadrunner75]

PA/NJ's I-295 and NY's I-295 are just under 60 miles apart as the crow flies, but about 88 miles if you actually went by interchanges with their parent route in PA and NY (and a little shorter if you count the non-interchange in NJ between 95 and 295.

[jeffandnicole]

I-495 in MD and I-495 in DE are 95 miles apart.

[TheHighwayMan3561]

Did they ever connect the IN and KY 265s? If not, there's your winner.

[jp the roadgeek]

At their closest points as the crow flies (Riverhead and near Wrentham), I-495 in NY and I-495 in MA are about 104 miles apart.  Wouldn't be that much more if you took the New London ferry, but doubling back to NYC adds about 180 miles.

The I-695 in NY and the cancelled I-695 in NJ would have been roughly 35 miles apart as the crow flies.   

[ozarkman417]

This one is a bit is a stretch, but I-580 (NV) and I-580 (CA) are a little over 200 miles apart.

[DJ Particle]

I-495 in MA and (unsigned) I-495 in ME.

71 miles....not THE closest, but likely one of the top 5, and possibly the closest involving travel in THREE states.

https://www.google.com/maps/dir/43.7193872,-70.3054398/I-95,+Salisbury,+MA+01952/@43.3328722,-71.2116812,9z/data=!4m9!4m8!1m0!1m5!1m1!1s0x89e2e6adff07796d:0xbd34db3c065b5328!2m2!1d-70.8954222!2d42.8583836!3e0

[ilpt4u]

Did they ever connect the IN and KY 265s? If not, there's your winner.

Not yet signed in the field, but AASHTO approved designating the East End Crossing as IN/KY I-265 for a unified I-265

[Henry]

Speaking of I-265, it and the former downtown Nashville route were 158 miles apart.

If the Pocahontas Parkway had been allowed to remain I-895 instead of downgraded to a VA route, it and the MD I-895 would've been 157 miles apart.

[Roadgeekteen]

Did they ever connect the IN and KY 265s? If not, there's your winner.

Were they not considered the same route?

[NWI_Irish96]

Did they ever connect the IN and KY 265s? If not, there's your winner.

Were they not considered the same route?

Until 2015, they were two separate, unconnected roads.  In 2015, a bridge and roadway was finished that connected the two.  Since then, the states have gotten approval to sign the new roadway as I-265 but have yet to actually do so.

[hbelkins]

Did they ever connect the IN and KY 265s? If not, there's your winner.

Were they not considered the same route?

Until 2015, they were two separate, unconnected roads.  In 2015, a bridge and roadway was finished that connected the two.  Since then, the states have gotten approval to sign the new roadway as I-265 but have yet to actually do so.

And I've never heard what the holdup is on that. Given that Kentucky has breathlessly announced the news every time a parkway has been designated as a future interstate, I'm surprised nothing was ever released.

[kphoger]

Did they ever connect the IN and KY 265s? If not, there's your winner.

Amazingly, though, even if it counts, it only beats Reply #2 by less than five miles.

[mrcmc888]

I-220 in Jackson to I-220 in Shreveport is around 215 miles.

[bing101]

I-215 California, CC-215, I-215 Nevada has to be at least 200 miles apart.

[jp the roadgeek]

All of these are about 140 miles apart:

I-195 in MD and I-195 in NJ
I-195 in RI and I-195 in ME
I-295 in MA and I-295 in ME

At one time, I-895 in MD was 65 miles from the temporary I-895 in DE when I-95 was rerouted onto today's I-495.  And then I-895 in Delaware would have been about 50 miles from the unbuilt I-895 that would've utilized the Burlington-Bristol Bridge.

[DTComposer]

This one is a bit is a stretch, but I-580 (NV) and I-580 (CA) are a little over 200 miles apart.

Interestingly (to me, anyway), the two points at which they are the closest to each other (172 miles) is I-580 (CA) at I-205 near Tracy to the southern end of I-580 (NV) in Carson City. The 172-mile path to connect them:

I-205/I-5/CA-4/CA-99/CA-88/NV-88/US-395

...doesn't go within 40 miles of the parent Interstate (I-80).

[WNYroadgeek]

NY I-490 (LeRoy) and OH I-490 (Cleveland) are 237 miles apart.

NY I-290 (Williamsville) and cancelled OH I-290 (Cleveland) would have been roughly 176 miles apart.