Most intersections between the same two routes?

[roadman]

I-91 and US 5 intersect 8 times in Massachusetts.

[Brandon]

Illinois:

I-74 and US-150: These cross 10 times, some of which don't even have an interchange.
I-70 and US-40: These cross/meet 9 times.  US-40 does use I-70 between some of the interchanges where they meet.

[hbelkins]

Illinois:

I-74 and US-150: These cross 10 times, some of which don't even have an interchange.

Those don't count.

Upon closer review, Kentucky's champion may be US 27 and KY 1247. They intersect 12 times in Pulaski and Lincoln counties. KY 1247 is the old alignment of US 27 and it parallels the newer route very closely between Somerset and Stanford.

[roadman65]

If I had to guess the national winner, it would be I-95/US 1.

From Florida to Maine, 37 total times where the routes intersect with at least one connection, an additional 3 times where they intersect with a grade-separation and no connection.

US 1
1) Miami
2) Ormond Beach, FL
3)Jacksonville, FL
4)Jacksonville, FL- Now Overlap
5) Jacksonville, FL- MLK Pky
6) Richmond, VA- Chamberlayne Ave.
7) Richmond, VA- Brook Rd.
8) Fredericksburg, VA
9) Alexandria,VA
10) College Park, MD
11) Newark, NJ (Truck US 1 & 9 counts)
12) Geo Wash Br.
13) Harrison, NY
14) Rye, NY
15)Stamford, CT
16) Darien, CT
17) Milford, CT
18) New Haven, CT
19) Old Saybrook, CT
20) New London- Groton, CT
21) Providence Area
22) Dedham, MA (Wrongway concurrency)
23) North of Boston
24) Houlton, ME

In regards to I-95, I wouldn't be surprised it intersected with US 301 more than US 1.

Only 19 total times where the routes intersect with at least one connection, all in South Carolina, North Carolina, and Virginia.

US 301
1) Santee. SC
2) Manning, SC
3) NC-SC Border
4) Lumberton, NC Overlap
5) Lumbrton, NC Crossing
6)St. Pauls, NC
7) Kenly, NC
8) Jarrat, VA
9) Petersburg, VA
10) Richmond, VA
11) RIchmond, VA (Only SB Lanes cross)


US 1 lost one when I-295 took over at Oxford Valley and the interchange in Lawrence, NJ never had I-95 cross the US route.

[roadman65]

US 13 and DE 1 meet several times, but no intersections or ramps between.  I must admit this is a hard one, but keeps the mind going  as so many routes do parallel but either don't meet formally nor cross like Florida. US 1 and I-95 meet only 6 times in over 350 miles of companionship.

US 90 and I-10 in almost the same manner cross only 3 times.

You get the idea.  As many can be said in the whole US.

[webny99]

I mean, clearly it's I-81 and US-11. It was already mentioned that Virginia has 16. I'm counting at least 5 in PA, and New York has at least 10-12, depending on how we account for partial interchanges (less than 4 ramps).

Only problem is, no one has time to get a formal I-81/US 11 count for the entire country.
So, we might as well give some other routes the floor, even though they could never come close to being the actual winner. 

[Finrod]

I-65 and US 231 barely make this list with 4 crossings, but that includes three in a row (consecutive interchanges on I-65).  Anyone have more where one of the highways is controlled-access?

[roadman]

If I had to guess the national winner, it would be I-95/US 1.

From Florida to Maine, 37 total times where the routes intersect with at least one connection, an additional 3 times where they intersect with a grade-separation and no connection.

It's actually 39 times.  US 1 and I-95 intersect 3 times between Boston and the NH line.  Once in Lynnfield, again at the Peabody/Danvers line, and again near the Danvers/Topsfield line. 

[Some one]

Like someone else mentioned earlier I-10 and US 90 intersect with each other about 24 times, with 11 of those being in Texas.

I-20 and US 80 only intersect with each other once in Texas. It would've been a lot more if US 80 hadn't been truncated. Likewise with I-35 and US 81, I-45 and US 75, I-40 and US 66, and maybe I-10 and US 80 and 290.

I-35 (and 35E) and US 77 intersect about 10 times. 6 in Texas and 4 in Oklahoma.

I-30 and US 67 only intersect with each other 4 times, with 3 in Arkansas and just one concurrency in Texas. A lot less than I thought it'd be.

[cl94]

National winner is almost certainly I-95 and US 1. The number of interchanges between those two routes is absurd.

New York...let's address the possibilities:

I-87 / US 9 - 5 direct interchanges. Depending on how you count Exit 22 (reference route) and Exit 33 (short spur), could be as high as 7.
I-81 / US 11 - 9 direct interchanges, a few of which are partial
I-88 / NY 7 - Surprisingly, only 2 direct interchanges and 1 concurrency, but half of exits are signed for NY 7 and the connection is usually a short reference route.
I-90 / US 20 - Only 2 direct interchanges
I-190 / NY 266 - 5 direct interchanges, most of which are partial
I-390 / NY 15 - 4 direct interchanges
I-490 / NY 96 - 4 direct interchanges, 1 of which is partial
US 9W / NY 32 - 4, all concurrencies. This might be the most concurrencies between 2 routes in NY.

[TheGrassGuy]

I-287 has 7 interchanges with US 202 in NJ (10 if you count one-way interchanges as separate). The true winner, though, is the GSP and US 9 (15 interchanges).

[webny99]

depending on how we account for partial interchanges (less than 4 ramps).

HB, I defer to you on this. The Binghamton-Syracuse segment of I-81/US 11 really needs to be taken case by case in this regard. There's tons of bits and pieces of interchanges but few full, clear-cut ones.

There's also the I-81/US 11 junction just north of the Scranton Airport, where there's weirdly direct ramps between the two routes without the routes actually crossing, so that's another situation we'll have to decide how to account for.

[TheGrassGuy]

I mean, clearly it's I-81 and US-11. It was already mentioned that Virginia has 16. I'm counting at least 5 in PA, and New York has at least 10-12, depending on how we account for partial interchanges (less than 4 ramps).

Only problem is, no one has time to get a formal I-81/US 11 count for the entire country.
So, we might as well give some other routes the floor, even though they could never come close to being the actual winner. 

I'll try my best:
New York
1. Kellogg Hill - Indirect connection to US 11, signed as "US 11"
2. Ellisburg - Direct connection to US 11
3. Tinker Tavern Rd - Indirect connection to US 11, signed as "TO US 11"
4. Brewerton - Indirect connection to US 11, signed as "TO US 11"
5. Mattydale - Direct connection to US 11
6. Salina St, Brighton Ave - Indirect-ish connection to US 11, not signed at all
7. Onondaga - Direct connection to US 11
8. LaFayette - Direct signed connection to US 11 NB, indirect unsigned connection to US 11 SB
9. Homer - Indirect connection to US 11, signed as "US 11"
10. McGraw - Indirect connection to US 11 NB, direct connection to US 11 SB, signed both ways
11. Marathon - Indirect connection to US 11 NB, direct connection to US 11 SB, signed both ways
12. Triangle/Barker - Two separate interchanges with the same number, indirect connection to US 11, signed as "TO US 11"
13. Castle Creek - Direct connection to US 11
14. Chenango Bridge - Direct connection to US 11
15. Dickinson - Direct connection to US 11
16. Kirkwood - Indirect connection to US 11 SB, signed as "TO US 11"
17. Kirkwood - One interchange with two separate numbers, indirect connection to US 11, signed as "US 11"
18. Kirkwood - Indirect connection to US 11 SB, signed as "US 11"

[TheGrassGuy]

Moving on into Pennsylvania:
1. Clarks Summit - Indirect connection to US 11, signed as "US 11"
2. North Scranton - Indirect connection to US 11, signed as "US 11"
3. Moosic - Indirect-ish connection to US 11, signed as "US 11 [SOUTH]", no SB access to US 11 north
4. Enola/Marysville - Direct connection to US 11
5. Camp Hill - Very indirect connection to US 11, signed as "TO US 11" [Wikipedia is wrong]
6. Middlesex - Direct connection to US 11
7. Antrim Twp - Direct connection to US 11

[TheGrassGuy]

There's only one in Maryland:
1. Williamsport - Direct connection to US 11

And one in West Virginia:
1. Marlowe/Falling Waters - Direct connection to US 11

[TheGrassGuy]

There are a ton in Virginia, and I am not the first one to have pointed this out:
1. Whitehall - Indirect connection to US 11, signed as "TO US 11"
2. Winchester - Direct connection to US 11
3. Kernstown - Indirect connection to US 11, signed as "TO US 11"
4. Strasburg - Direct connection to US 11
5. Shenandoah Caverns - Indirect connection to US 11, signed as "TO US 11"
6. Mauzy - Direct connection to US 11 NB, Indirect connection to US 11 SB, signed both ways
7. Harrisonburg - Indirect-ish connection to US 11, signed as "US 11"
8. Harrisonburg - Indirect-ish connection to US 11, signed as "US 11"
9. Staunton - Indirect connection to US 11, signed as "TO US 11"
10. Greenville - Direct connection to US 11
11. Lexington - Direct connection to US 11
12. Fancy Hill - Direct connection to US 11
13. Natural Bridge - Concurrency with US 11
14. Buchanan - End of concurrency
15. Buchanan - Direct connection to US 11
16. Troutville - Indirect connection to US 11, signed as "TO US 11"
17. Troutville - Direct connection to US 11 NB (though only signed as such for US 11 NORTH), indirect connection to US 11 SB (and also US 11 SOUTH NB if you're an obstinate sign follower )
18. Dixie Caverns - This is short enough to be signed as "incorrect-ish", I hope ; not signed at all
19. Ironto - Indirect connection to US 11, signed as "TO US 11" (how come this is signed but the previous one isn't? )
20. Christiansburg - Direct connection to US 11, but you can access US 11 from the B exit too (and maybe even the A exit as well for NB; can somebody please check this? )
21. Pulaski - oH yEs AnOtHeR cOnCuRrEnCy
22. Wytheville - Concurrency END
23. Wytheville - Direct connection to US 11 NB
24. Atkins - Indirect connection to US 11, signed as "US 11"
25. Marion - Indirect-ish connection to US 11 NB, signed as "US 11", direct connection to US 11 SB
26. Marion - Two separate interchanges under one exit number, direct connection to US 11 NB, indirect connection to US 11 SB, signed as "US 11"
27. Seven Mile Ford - Direct connection to US 11
28. Chilhowie - Direct connection to US 11
29. Abingdon - Direct connection to US 11
30. Abingdon - Indirect connection to US 11, not signed at all
31. Lee Highway - Indirect connection to US 11, not signed at all
32. Lee Highway - Indirect connection to US 11, signed as "US 11" (I wonder what that space between the US 11 and US 19 shields is for, though )
33. Lee Highway/Bristol - Direct connection to US 11

[TheGrassGuy]

And last but not least, Tennessee!
1. Bristol - Direct connection with US 11W
2. Mosheim - Direct connection with US 11E

[TheGrassGuy]

18 + 17 + 1 + 1 + 33 + 2 = 72.

There are 72 intersections between I-81 and US 11. Case closed.

[cl94]

18 + 17 + 1 + 1 + 33 + 2 = 72.

OP stated that indirect interchanges do not count.

[TheGrassGuy]

18 + 17 + 1 + 1 + 33 + 2 = 72.

OP stated that indirect interchanges do not count.

Wow, I'm stupid. 

[cl94]

18 + 17 + 1 + 1 + 33 + 2 = 72.

OP stated that indirect interchanges do not count.

Wow, I'm stupid. 

Concurrencies only count once as well. I'm seeing no more than 39 that make the grade.

[hotdogPi]

Since it's per state:

Are there any states that have no examples at all of routes meeting twice?

[TheGrassGuy]

*sigh...* Here we go again... 

New York
0, I guess? Kellogg Hill - Indirect connection to US 11, signed as "US 11"
1. Ellisburg - Direct connection to US 11
1 1/2. Tinker Tavern Rd - Indirect connection to US 11, signed as "TO US 11"
1 3/4. Brewerton - Indirect connection to US 11, signed as "TO US 11"
2. Mattydale - Direct connection to US 11
3?. Salina St, Brighton Ave - Indirect-ish connection to US 11, not signed at all
4. Onondaga - Direct connection to US 11
5. LaFayette - Direct signed connection to US 11 NB, indirect unsigned connection to US 11 SB
5 1/2. Homer - Indirect connection to US 11, signed as "US 11"
5 3/4. McGraw - Indirect connection to US 11 NB, direct connection to US 11 SB, signed both ways
5 7/8. Marathon - Indirect connection to US 11 NB, direct connection to US 11 SB, signed both ways
5.9999999999999999999. Triangle/Barker - Two separate interchanges with the same number, indirect connection to US 11, signed as "TO US 11"
6. Castle Creek - Direct connection to US 11
7. Chenango Bridge - Direct connection to US 11
8. Dickinson - Direct connection to US 11
8 1/2. Kirkwood - Indirect connection to US 11 SB, signed as "TO US 11"
8 3/4. Kirkwood - One interchange with two separate numbers, indirect connection to US 11, signed as "US 11"
8 7/8. Kirkwood - Indirect connection to US 11 SB, signed as "US 11"

That State With Bad Roads Beginning With A "P"
-1. Clarks Summit - Indirect connection to US 11, signed as "US 11"
0. North Scranton - Indirect connection to US 11, signed as "US 11"
1/2. Moosic - Indirect-ish connection to US 11, signed as "US 11 [SOUTH]", no SB access to US 11 north
1. Enola/Marysville - Direct connection to US 11
Not 2. Camp Hill - Very indirect connection to US 11, signed as "TO US 11" [Wikipedia is wrong]
2. Middlesex - Direct connection to US 11
3. Antrim Twp - Direct connection to US 11

One each in Jumbo Crab Bucket and Coal Heap

vErJiNyA
0.[/shadow][/glow][/u][/i][/b] Whitehall - Indirect connection to US 11, signed as "TO US 11"
1. Winchester - Direct connection to US 11
√2. Kernstown - Indirect connection to US 11, signed as "TO US 11"
2. Strasburg - Direct connection to US 11
please no 3. Shenandoah Caverns - Indirect connection to US 11, signed as "TO US 11"
3. Mauzy - Direct connection to US 11 NB, Indirect connection to US 11 SB, signed both ways
4? Harrisonburg - Indirect-ish connection to US 11, signed as "US 11"
5? Harrisonburg - Indirect-ish connection to US 11, signed as "US 11"
5 1/2. Staunton - Indirect connection to US 11, signed as "TO US 11"
6. Greenville - Direct connection to US 11
7. Lexington - Direct connection to US 11
8. Fancy Hill - Direct connection to US 11
9. Natural Bridge - Concurrency with US 11
NOT 10 PLS I BEG U. Buchanan - End of concurrency
10. Buchanan - Direct connection to US 11
10 1/2. Troutville - Indirect connection to US 11, signed as "TO US 11"
11. Troutville - Direct connection to US 11 NB (though only signed as such for US 11 NORTH), indirect connection to US 11 SB (and also US 11 SOUTH NB if you're an obstinate sign follower )
Someone please help me decide if this should be 12. Dixie Caverns - This is short enough to be signed as "incorrect-ish", I hope ; not signed at all
not 12. Ironto - Indirect connection to US 11, signed as "TO US 11" (how come this is signed but the previous one isn't? )
13. Christiansburg - Direct connection to US 11, but you can access US 11 from the B exit too (and maybe even the A exit as well for NB; can somebody please check this? )
14. Pulaski - oH yEs AnOtHeR cOnCuRrEnCy
10*√2. Wytheville - Concurrency END
15. Wytheville - Direct connection to US 11 NB
15 1/2. Atkins - Indirect connection to US 11, signed as "US 11"
16? Marion - Indirect-ish connection to US 11 NB, signed as "US 11", direct connection to US 11 SB
17 and not 18. Marion - Two separate interchanges under one exit number, direct connection to US 11 NB, indirect connection to US 11 SB, signed as "US 11"
18. Seven Mile Ford - Direct connection to US 11
19. Chilhowie - Direct connection to US 11
20. Abingdon - Direct connection to US 11
9 + 10. Abingdon - Indirect connection to US 11, not signed at all
10 + 9. Lee Highway - Indirect connection to US 11, not signed at all
9 + 10 + 9 + 10 + 9 + 10 + 9 + 10. Lee Highway - Indirect connection to US 11, signed as "US 11" (I wonder what that space between the US 11 and US 19 shields is for, though )
21. Lee Highway/Bristol - Direct connection to US 11

TeNiSi
1. Bristol - Direct connection with US 11W
2. Mosheim - Direct connection with US 11E

[TheGrassGuy]

8 + 3 + 1 + 1 + 21 + 2 = 36.

[TheGrassGuy]

Concurrencies only count once as well. I'm seeing no more than 39 that make the grade.

Which of the "indirect-ish" interchanges did you count?