Longest Three- (or More) Route Concurrency

[Henry]

We all know that I-80/I-90 between Cleveland and Chicago is a long two-route concurrency, as is I-64/I-77 on the WV Turnpike.

That being said, what is the longest concurrency of three routes or more?

[Mr_Northside]

I-376 / US-22 / US-30 run concurrent for about 18 miles or so in the Pittsburgh area.  That's the first one that comes to mind in PA.

[hotdogPi]

Maybe US 4 / NH 9 / US 202?

[Road Hog]

US 64-67-167 is concurrent for about 27 miles (Exit 28 to Exit 55). It's actually even signed!

[Big John]

I-39/90/94 From Portage to Madison WI.  About 30 miles.

[Brandon]

For interstates, it's I-39/90/94 from Madison to Portage in Wisconsin.  I-80/90/294 is a former one, albeit a shorter one between the Calumet Expressway (South Holland) and the Indiana Toll Road (Lake Station).

[SD Mapman]

For overall highways, somewhere in Georgia.

[hotdogPi]

What about ME 11 / ME 100 / US 202?

[corco]

I've got a few good, long ones

US 14/16/20 in Wyoming- 105 miles
US 87/MT 3/MT 200 in Montana- 95 miles
US 20/26/87 in Wyoming - 65 miles

I-25/US 85/US 87 in Colorado and New Mexico (though unsigned) - 145 miles

[Eth]

For overall highways, somewhere in Georgia.

Probably some good candidates here, yeah. Anywhere you have a concurrency of two US routes, there's also a state route along for the ride. (Also true in Alabama and Florida, but in those cases the state route is unsigned.)

Taking just a quick glance, US-19/US-41/GA-3 is probably 40-50 miles. US-23/US-441/GA-15 is around 50 miles. US-1/US-23/GA-4 looks to be about 70 miles. Not sure if there are any longer ones; maybe US 129/441 or 319/441?

[Scott5114]

Some from Oklahoma:
Clayton NM to east of Boise City OK: US-56/64/412 (with US-385 and OK-3 along for part of the ride)–51 miles
East of Boise City to Guymon: US-64/412/SH-3 (with SH-136 along for part of the ride)–55 miles
Bryan's Corner to Woodward: US-270/412/SH-3 (with US-183 along for part of the ride)–69 miles

[Alps]

I-25/US 85/US 87 in Colorado and New Mexico (though unsigned) - 145 miles

That is the one I was thinking of as the probable winner.

[NE2]

I-25/US 85/US 87 in Colorado and New Mexico (though unsigned) - 145 miles

That is the one I was thinking of as the probable winner.

It's actually 137 miles, but probably still wins.

[SD Mapman]

I've got a few good, long ones

US 14/16/20 in Wyoming- 105 miles
US 87/MT 3/MT 200 in Montana- 95 miles
US 20/26/87 in Wyoming - 65 miles

I-25/US 85/US 87 in Colorado and New Mexico (though unsigned) - 145 miles

It's all 'cause of those blasted mountains! mountains... grumble, grumble

[english si]

M2/E65/E80 through the entirety of Montenegro 339km (210 miles).

[Alps]

M2/E65/E80 through the entirety of Montenegro 339km (210 miles).

I don't know how I feel about E routes. That's like saying the Trans-Canada Highway is co-signed with ON 11 and 17.

[english si]

Not at all - they are like US routes, only most states doing what Florida does, only not hiding the concurrent routes.