Longest distance between consecutive junctions of the same two routes

[TheHighwayMan3561]

US 61 and US 63 meet at Lake City, MN and then meet again in Turrell, AR some 750 miles apart. I-90 and I-94 meeting at Billings and Tomah, WI is another one that comes to mind.

What I am not looking for are examples such as I-95/US 1 which have two distant meeting points in Houlton/Miami with many interchanges inbetween. Just the longest between only two consecutive junctions of the same two routes.

Examples can be current or historic, as well as national examples and those from within just your state if applicable.

[roadman65]

US 1 & 17 between Fredericksburg, VA and Jacksonville, FL?

[froggie]

What I am not looking for are examples such as I-95/US 1 which have two distant meeting points with many inbetween. Just the longest between only two junctions of the same two routes.

I understand why you mentioned what you did with I-95/US 1, but it's still funny you did so since there's an almost 600 mile section between two adjacent junctions of the two routes (Richmond, VA to Jacksonville, FL).

[jp the roadgeek]

It's over 2500 miles between junctions of US 20 and I-84 (Mountain Home, ID and Sturbridge, MA).  Yes, I know it's 2 different I-84's

[JustDrive]

I-5 and US 101 in Los Angeles, CA and Tumwater, WA (roughly 1075 miles apart)

[CNGL-Leudimin]

US 6 and US 66 used to cross in Joliet IL and then in Los Angeles CA. No less than 2100 miles either way.

[paulthemapguy]

I-5 and US 101 in Los Angeles, CA and Tumwater, WA (roughly 1075 miles apart)

I have a feeling this is the one that takes the gold medal here.

For east-west routes I was thinking maybe I-10 and US190, between the west end of US190 in West Texas, and Slidell, LA.  That's an over 800 mile drive (idk what it is as the crow flies).

[Thing 342]

It's about 900 miles between US-30 and I-80's junctions in Pine Bluffs, WY, and Joliet, IL

[theline]

Two roads that parallel each other and cross over many times, I-90 and US-20, go about 343 miles between intersections. Westbound they intersect at Euclid Avenue (exit 186) in east Cleveland, OH and then at Indianapolis Avenue (exit 0 on the ITR) in Hammond, IN. Eastbound they go from exit 107 of the Chicago Skyway to Euclid Avenue in Cleveland. Exit 107 is essentially the same exit at exit 0, since they straddle the state line.

[CobaltYoshi27]

I think I-5 and US 101 win, but I found I-15 and US 89 to have a gap of 561 miles (Farmington, UT to Great Falls, MT).

[paulthemapguy]

(In the event that you all want an added challenge...)
What if we revise the criteria to EXCLUDE any endpoints of highways?  In other words, what's the longest distance between the same two highways crossing one another and continuing onward?  This would render both junctions of I-5 and US101 inapplicable.  My example of US190 and I-10 would also be disqualified because it includes the west end of US190.

(And of course continue brainstorming without my added rule, too)

[roadman65]

What about US 13 and I-95?  I know that in Chester, PA the routes do not interchange, but from that crossing to where it meets near Eastover, NC is over 400 miles.  Considering that US 13 does junction for real at NE Philadelphia or should I really say Bucks County at PA 132 (that indirectly connects the two as US 13 and I-95 run parallel to each other closely) that would make it more than the un-interchanged crossing in Chester to Eastover.

Or are we not including terminuses as US 13 now technically ends at I-95, being that US 301 does not connect to it anymore?

[NWI_Irish96]

Not an endpoint for either: 1039 miles between the junctions of US 36 and US 40 in Byers, CO, and Indianapolis, IN

[CobaltYoshi27]

(In the event that you all want an added challenge...)
What if we revise the criteria to EXCLUDE any endpoints of highways?  In other words, what's the longest distance between the same two highways crossing one another and continuing onward?  This would render both junctions of I-5 and US101 inapplicable.  My example of US190 and I-10 would also be disqualified because it includes the west end of US190.

(And of course continue brainstorming without my added rule, too)

That eliminates I-90 and I-94 (Billings, MT to Tomah, WI) which was 1004 miles.

[kkt]

I-5 and US 101 in Los Angeles, CA and Tumwater, WA (roughly 1075 miles apart)

I was gonna say that.  I can't think of an east-west pair that would exceed that.

[jp the roadgeek]

But it WOULDN'T disqualify my I-84/US 20 scenario (almost does in the MA case).  Speaking of US 20, there's 311 miles between junctions with I-90 in NY State (Thruway Exit 58 and Free 90 Exit 11. Free 90 Exit 1S is marked TO US 20, but they don't cross)

[CobaltYoshi27]

But it WOULDN'T disqualify my I-84/US 20 scenario (almost does in the MA case).  Speaking of US 20, there's 311 miles between junctions with I-90 in NY State (Thruway Exit 58 and Free 90 Exit 11. Free 90 Exit 1S is marked TO US 20, but they don't cross)

Technically, they're not the same road... I don't think it would count regardless.

[TheHighwayMan3561]

Found another contender: I-90 and US 12. 1,261 miles between junctions at Tomah and at Garrison, Montana.

[jmacswimmer]

I-95 and US 17 go 475 miles between junctions (and overlaps) between Point South, SC & Fredericksburg, VA.

I-95 and US 202 also go 475 miles between Wilmington, DE & Gray, ME.

[GaryV]

US-127 ends just a couple miles shy of I-75 at the south end.  Else it would be nearly 800 miles from Grayling to Chattenooga.  Before US-27 was decommissioned in MI, it would have worked out.

[jflick99]

I-35 goes more than 900 miles between junctions with US-59. (Laredo, TX and Ottawa, KS)