Places Where Locals Refer to US/State Highways over Interstates.

[Some one]

Is there a concurrency (interstate and US/state highway) you know where locals call it the secondary route over the primary route? For example, in Houston, even though portions of 59 are now co-signed with 69, most Houstonians still refer to it as 59.

[US 89]

US 40/I-64 in St Louis

GA 400/US 19 north of Atlanta

[Max Rockatansky]

US 50 on FHWA I-305 in Sacramento.  Most people probably even aware FHWA I-305 is even a thing.  I would say US 50 is probably even more in common use these days than I-80 Business is.

[jp the roadgeek]

MA 128 over I-95 between Canton and Peabody

[TheHighwayMan3561]

Probably still a lot of Highway 51 instead of Highway 39 in central Wisconsin.

[dlsterner]

Is there a concurrency (interstate and US/state highway) you know where locals call it the secondary route over the primary route? For example, in Houston, even though portions of 59 are now co-signed with 69, most Houstonians still refer to it as 59.

Probably because the Interstate designation isn't posted anywhere, but I-595 between Washington D.C. and Annapolis is known as US 50 or US 50/301.

[Roadsguy]

Highway 41

The short segment of PA 581 that carries US 11 in Camp Hill is usually just called 581, though even PennDOT makes an exception and considers 581 the dominant route on mile markers and in their system (SR 0581, not 0011), likely a holdover from plans to eventually make it I-581. Most signage, though, has the US 11 shield before the PA 581 shield, except for this one which dates to the creation of the designation when the section connecting it to I-81 opened.

[GaryV]

US-131 in Grand Rapids.  I doubt a vast majority of the population even know it is (now unsigned) I-296.

[hbelkins]

Radio reports on WHAS in Louisville refer to I-265 as "841."

[roadfro]

I-515/US 93/US 95 in Las Vegas & Henderson, NV is often referred to as just US 95.

I-580/US 395 in Reno, NV is often referred to as just US 395.

While traffic reporters and local commercials in both areas now tend to refer to the interstate spur on the concurrent sections and the US route on the solo sections, long-time residents in both locations often use just refer to the US route out of habit.
In both cases, the freeway crosses the interstate parent, with the interstate spur ending and the US highway continuing seamlessly. Also, the interstate spur was signed much later than the freeway's initial construction in both cases (circa 1994-95 for I-515 and circa 2012 for I-580).

[Flint1979]

It doesn't happen here. Where there are interstates and state highways or us highways running together it's always called the interstate. Like US-23 multiplexes with I-75 for about 73 miles in Michigan it's always called I-75 and not the other highway, in this example US-23 is almost never refered to even though it's signed the whole way. South of Flint and the northern part of 23 are known as US-23 though which makes sense as US-23 runs on its own right of way.

[ozarkman417]

I'm sure there's plenty of people in this part of the state who still refer to I-49 as US-71, partly because the only parts 71 is not congruent to 49 in MO is where 49 does (not yet) exist.

[paulthemapguy]

I doubt it really happens in Illinois.  Interstate designations don't really multiplex in Illinois, aside from 39/51, 72/36, and the trials and tribulations of US40 and US50 in their quest to remain continuous through the STL metro.  Maybe there are some people from Springfield/Jacksonville who still refer to I-72 as US36?

And I think we can just discount mentions of unsigned Interstates over US routes.  Of course locals are going to recognized signed designations in the field over hidden ones.

[Michael]

The only multiplexed interstates in my area are I-86/NY 17 and if you're willing to count it, I-90 and the Thruway.  I don't think I've ever heard anyone call the Thruway I-90, and I'm not sure if people use I-86 or NY 17.  I use both.

For a US and state example, there's US 20/NY 5.  US 20 and NY 5 are multiplexed through the Finger Lakes, and most people call it "5 and 20".  All of the signs I've seen list US 20 first.  There used to be one sign I know of that listed NY 5 first, but it was replaced in 2013.

[3467]

We use 72 and have all forgotten 36. It's also central Illinois expressway.
Illinois 336 is now a pointless concurrency with 110 now. Confusing as well as it was a 36 related spur.

[vdeane]

The only multiplexed interstates in my area are I-86/NY 17 and if you're willing to count it, I-90 and the Thruway.  I don't think I've ever heard anyone call the Thruway I-90, and I'm not sure if people use I-86 or NY 17.  I use both.

For a US and state example, there's US 20/NY 5.  US 20 and NY 5 are multiplexed through the Finger Lakes, and most people call it "5 and 20".  All of the signs I've seen list US 20 first.  There used to be one sign I know of that listed NY 5 first, but it was replaced in 2013.

NY 17 is NY 17.  I don't think I hear I-86 much outside of DOT and roadgeeks.

The Thruway example holds for I-87 too.

I-587/NY 28 might count, but I'm not sure if either is in common usage over Colonial Chandler Drive.

I-790 on NY 5/8/12

[Beltway]

Probably because the Interstate designation isn't posted anywhere, but I-595 between Washington D.C. and Annapolis is known as US 50 or US 50/301.

Definitely the case.

Nobody calls it I-595 except for the infinitesimal percentage of the population that know about the unposted Interstate route number.

[bing101]

I-515/US 93/US 95 in Las Vegas & Henderson, NV is often referred to as just US 95.

I-580/US 395 in Reno, NV is often referred to as just US 395.

While traffic reporters and local commercials in both areas now tend to refer to the interstate spur on the concurrent sections and the US route on the solo sections, long-time residents in both locations often use just refer to the US route out of habit.
In both cases, the freeway crosses the interstate parent, with the interstate spur ending and the US highway continuing senselessly. Also, the interstate spur was signed much later than the freeway's initial construction in both cases (circa 1994-95 for I-515 and circa 2012 for I-580).

How about US-93 for the I-11 section from Las Vegas to the Arizona/Nevada State line. I bet the new I-11 freeway is still referred to as US-93 in some areas due to how new the road designation is though.

[J3ebrules]

The only multiplexed interstates in my area are I-86/NY 17 and if you're willing to count it, I-90 and the Thruway.  I don't think I've ever heard anyone call the Thruway I-90, and I'm not sure if people use I-86 or NY 17.  I use both.

For a US and state example, there's US 20/NY 5.  US 20 and NY 5 are multiplexed through the Finger Lakes, and most people call it "5 and 20".  All of the signs I've seen list US 20 first.  There used to be one sign I know of that listed NY 5 first, but it was replaced in 2013.

I was wondering if there were some 17 holdouts up there, since there's such historicity to the route.

[KeithE4Phx]

I'm sure it'll be a few years before I-69 between Bloomington and Indianapolis (once it's finished) will be called anything but Highway 37.

[TheStranger]

I would say US 50 is probably even more in common use these days than I-80 Business is.

Isn't some of that due to signing changes in the last 2-3 years where Business 80 now is only signed from US 50/Route 99 at the Oak Park Interchange to the 80/Business 80 split near Watt Avenue?  Some of it is also due to the US 50 carpool lane projects that emphasized the whole corridor (the El Dorado Freeway + WX Freeway + western segment of what was Business 80) as one number.

[Max Rockatansky]

I would say US 50 is probably even more in common use these days than I-80 Business is.

Isn't some of that due to signing changes in the last 2-3 years where Business 80 now is only signed from US 50/Route 99 at the Oak Park Interchange to the 80/Business 80 split near Watt Avenue?  Some of it is also due to the US 50 carpool lane projects that emphasized the whole corridor (the El Dorado Freeway + WX Freeway + western segment of what was Business 80) as one number.

Yes, I-80 Business was completely de-emphasized on US 50 aside from some reassurance shields on surface ramps.  Even CA 51 (at least in the roadgeek world) is starting to pick up traction over I-80 Business designations.  Granted, CA 51 isn't signed in field at all by legislative requirement.

[DJ Particle]

MA 128 over I-95 between Canton and Peabody

From what I'm hearing, that's becoming less common as time passes.

[sparker]

I would say US 50 is probably even more in common use these days than I-80 Business is.

Isn't some of that due to signing changes in the last 2-3 years where Business 80 now is only signed from US 50/Route 99 at the Oak Park Interchange to the 80/Business 80 split near Watt Avenue?  Some of it is also due to the US 50 carpool lane projects that emphasized the whole corridor (the El Dorado Freeway + WX Freeway + western segment of what was Business 80) as one number.

Yes, I-80 Business was completely de-emphasized on US 50 aside from some reassurance shields on surface ramps.  Even CA 51 (at least in the roadgeek world) is starting to pick up traction over I-80 Business designations.  Granted, CA 51 isn't signed in field at all by legislative requirement.

For all intents & purpose Biz 80 has evolved into more of a spur than a part of a functional loop; and even the city of Sacramento, which was the original driving force behind the Biz 80 designation to begin with, has apparently lost interest in the concept.   As a regional E-W corridor, labeling the whole West Sac/W-X/El Dorado freeway corridor as a single entity as US 50 is simply recognizing the reality that even when the loop was part of I-80 before 1982, most I-80 through traffic not having particular business in Sacramento veered off via (then) I-880 around the bypass.   Currently the 50 corridor rivals 80 in terms of both utility and, unfortunately, congestion; it's a much more useful designation for both local & through traffic.  The whole Biz 80 situation is well past its sell-by date; Caltrans should consider initiating a legislative remedy that allows CA 51 to be signed over its northeast segment.

[jeffandnicole]

In NJ, I-76 is often referred to as NJ 42, the route number south of I-76 but never a concurrency.

Occasionally, I've also heard it called I-676 from a few random people. I-676 is the route north of I-76.

But it's a rare day in hell when people actually refer to I-76 as I-76.