Multiplexes known by both numbers

[formulanone]

In the sort-of category: SR 7 / US 441 in Palm Beach, Broward, and Miami-Dade counties. It's usually referred to by one or the other (about 50/50), but rarely both except on signage.

[NE2]

In the sort-of category: SR 7 / US 441 in Palm Beach, Broward, and Miami-Dade counties. It's usually referred to by one or the other (about 50/50), but rarely both except on signage.

Even signage usually shows only 441 (on shields) or 7 (on street sign blades), unless things have changed recently.

[bugo]

Not quite the same, but the US 59/270 duplex is known as "hwy 59" in Oklahoma and "hwy 270" in Arkansas.

[bugo]

The street carrying the strangely discontinuous U.S. 85-87 in Fountain and Security, Colorado (doesn't actually connect back to I-25 on the north end) is named "Highway 85-87" and you often hear addresses using this. But, it's only marked as U.S. 85 since Colorado often only marks one route of a concurrent segment.

Where is the northern end?

[bugo]

The Hot Springs, AR bypass is known as "70-270" when only part of it is 70 and part of it is 270.

Judging from old postcards and promotional materials, the highway heading southwest of Little Rock was once called "67-70". Now the corridor is I-30 and both highways have been rerouted to that freeway (unsigned of course) and the old highway is now AR 5.

[dgolub]

The 6/10 expressway in Providence.  8/25 connector in Bridgeport

CT 25/CT 8 and NY 106/NY 107 are the two that come to mind immediately.  When the traffic reporters say "25/8" really fast, it sounds like "25A."  The first few times I heard it, I thought they were talking about NY 25A on Long Island, which was surprising for a Connecticut radio station.

[froggie]

Back when US-211 ran all the way into DC on a concurrency with US-29, people in Northern Virginia usually referred to "29-211."

A few old timers still refer to it as such.  That or "Lee Highway".

[formulanone]

In the sort-of category: SR 7 / US 441 in Palm Beach, Broward, and Miami-Dade counties. It's usually referred to by one or the other (about 50/50), but rarely both except on signage.

Even signage usually shows only 441 (on shields) or 7 (on street sign blades), unless things have changed recently.

Some intersections have SR 7 shields, other will have US 441. But along some of the six/eight-lane sections in Palm Beach County:



(ginormoshield?)

[Dr Frankenstein]

I've heard (second-hand) that some older West Islanders in Montreal still use "2-20" even though the Hwy 2 designation has not existed for decades.

I've heard "20-132" to refer to the René-Lévesque Expy maybe once or twice, but you're better off using just 132 for all of it.

[tidecat]

I-20/59 in Alabama (especially in Tuscaloosa)

[6a]

"Twenty-two and Three" as well as "Sixty-two and Three" for the US 22/SR 3 multiplex and US 62/SR 3 multiplex in Ohio between Cincinnati and Columbus

I've never heard 62 & 3 here, it's always 3-C.

[vtk]

"Twenty-two and Three" as well as "Sixty-two and Three" for the US 22/SR 3 multiplex and US 62/SR 3 multiplex in Ohio between Cincinnati and Columbus

I've never heard 62 & 3 here, it's always 3-C.

I think I've heard it, but it would have to be a minority reading.  Sixty Two, or Three, or Three C are all more common.