What is the longest signed Alternate or bannered route?

[CNGL-Leudimin]

103? Here it says it is only 97 miles long (unless it crosses into another state). Anyway, better have it as Alt US 14 instead of its former number US 420, as it would fall victim to thieves (the same reason why US 491 exists).

Here's the top 25 US Business Routes, per TravelMapping data:

Code Select Expand

+--------+-------+--------+-------------------+---------+
| region | route | banner | city              | mileage |
+--------+-------+--------+-------------------+---------+
| TX     | US90  | Alt    | Hallettsville, TX | 181.209 |
| TN     | US41  | Alt    | Nashville, TN     | 158.801 |
| SC     | US17  | Alt    | Summerville, SC   | 124.284 |
| NV     | US93  | Alt    | Wendover, NV      | 118.617 |
| NV     | US95  | Alt    | Yerington, NV     | 106.962 |
| WY     | US14  | Alt    | Powell, WY        | 96.7015 |
| FL     | US27  | Alt    | Perry, FL         | 94.8719 |
| GA     | US27  | Alt    | Newnan, GA        | 94.5854 |
| TX     | US77  | Alt    | Cuero, TX         | 91.3049 |
| AZ     | US89  | Alt    | Fredonia, AZ      |  87.076 |
| VA     | US58  | Alt    | Abingdon, VA      | 84.5404 |
| AL     | US78  | Alt    | Jasper, AL        | 84.2952 |
| NY     | US20  | Alt    | Geneseo, NY       | 83.7865 |
| NC     | US64  | Trk    | Henderson, NC     | 78.6879 |
| TN     | US31  | Alt    | Nashville, TN     | 77.7614 |
| NV     | US93  | Trk    | Laughlin, NV      | 75.3742 |
| AL     | US72  | Alt    | Decatur, AL       | 69.2461 |
| NC     | US264 | Alt    | Wilson, NC        | 64.5371 |
| MS     | US45  | Alt    | West Point, MS    | 64.4356 |
| CA     | US50  | Alt    | Pollock Pines, CA | 63.0346 |
| TN     | US70  | Alt    | Gibson, TN        | 62.0524 |
| NC     | US74  | Alt    | Asheville, NC     | 53.8992 |
| OH     | US20  | Alt    | Maumee, OH        | 52.9627 |
| ME     | US1   | Alt    | Bangor, ME        | 50.4554 |
| KY     | US41  | Alt    | Dixon, KY         | 50.3681 |
+--------+-------+--------+-------------------+---------+


Truck US 93 in NV continues into AZ, so it is longer than 75 miles. This route is not needed now the Hoover dam bypass is open.

[PHLBOS]

MA 1A is 95 miles

MA 3A is 97 miles

MA 2A has those beat at 98 miles.  Like 1A & 3A; the listed mileages includes concurrencies with its parent route.

Since the OP is looking for actual signed routes; IMHO, one should not include the parent concurrencies whether they're silent or not.  There are 2 maybe 3 signed concurrencies (usually on relatively short segments) with their parent routes but the rest are silent/unsigned.

That said:
MA 1A itself is just over 65 miles w/4 segments,

MA 2A is just over 81 miles w/3 segments,

and MA 3A is just under 76 miles w/2 segments.

Side bar: if one were to include its parent eastern & western concurrencies, MA 20A would be the longest in the Bay State at just over 154 miles.  However and in the real world, MA 20A itself is only about 4 miles.

[Rothman]

MA 1A is 95 miles

MA 3A is 97 miles

MA 2A has those beat at 98 miles.  Like 1A & 3A; the listed mileages includes concurrencies with its parent route.

Hm.  Although perhaps technically concurrent, I'm pretty sure the concurrency with MA 2 between Greenfield and Orange is not signed accordingly, if at all.

See here for where MA 2A hits MA 2 east of Greenfield:

https://goo.gl/maps/KSz9ReaF86T2

[PHLBOS]

Hm.  Although perhaps technically concurrent, I'm pretty sure the concurrency with MA 2 between Greenfield and Orange is not signed accordingly, if at all.

See here for where MA 2A hits MA 2 east of Greenfield:

https://goo.gl/maps/KSz9ReaF86T2

I was editing my earlier post when you replied.  See my above-edit showing the mileages with all parent concurrencies deleted.

[Avalanchez71]

I had forgotten about US 41A.  It does run concurrently in Nashville, TN wtih US 41.  It is signed in at least one place in Nashville with the concurrency.  I believe someone posted that the route logs to also mention that it is offically concurrent as well.

It runs from Monteagle, TN to Hopkinsville, KY.

[andy3175]

Truck US 93 in NV continues into AZ, so it is longer than 75 miles. This route is not needed now the Hoover dam bypass is open.

Is that truck route still around? I haven't been through there but had assumed it would go away with the completion of the Hoover Dam Bypass bridge.

[hotdogPi]

Someone mentioned MA 1A and MA 3A. Both of those extend into New Hampshire.

[PHLBOS]

Someone mentioned MA 1A and MA 3A. Both of those extend into New Hampshire.

The southernmost leg of MA 1A extends into RI as well.

[kkt]

US 14A in northern Wyoming is 103 miles long, including a massively steep incline into the Bighorn Mountains. It's also where you can find this doozy of a sign...

Holy message loading, Batman!

[Rothman]

US 14A in northern Wyoming is 103 miles long, including a massively steep incline into the Bighorn Mountains. It's also where you can find this doozy of a sign...

Holy message loading, Batman!

I believe there's a turnout so you can "study carefully."

[andy3175]

US 14A in northern Wyoming is 103 miles long, including a massively steep incline into the Bighorn Mountains. It's also where you can find this doozy of a sign...

Holy message loading, Batman!

I believe there's a turnout so you can "study carefully."

Correct. Whenever WyDOT places a sign like this, they normally place it in a pullout, and often they place it perpendicular to the road which only allows those who use the pullout to read the sign.

[Bickendan]

I quite like that sign.

[formulanone]

Has to be FL A1A.  Almost 339 miles.

Arguably, it's not really an alternate route, just a distinctive route...to prevent confusion of "US 1", so the easternmost SR 1 could take the right place within Florida's road grid. If we just want to say "suffixed route", then I suppose it wins.

(A1A itself has no banners, unless you include "Alternate A1A" which has been a segment of FL 811 for decades.)

[dvferyance]

Business 20 in Rockford and Belvidere is like 21 miles long. Probably not the longest but most likely one of the longer business routes.

[roadfro]

IIRC before the Hoover dam bypass opened to traffic there was a Truck US 93 that was far longer than all other truck routes. While most, if not all, truck routes don't go further than 10 miles, this one was around 100 miles long.

Truck US 93 in NV continues into AZ, so it is longer than 75 miles. This route is not needed now the Hoover dam bypass is open.

Is that truck route still around? I haven't been through there but had assumed it would go away with the completion of the Hoover Dam Bypass bridge.

Important to note that this was signed (at least in Nevada) as "Truck Detour" US 93. It was never an officially recognized truck route by AASHTO or other organizations. It was always meant as a temporary truck-only detour, created out of necessity due to security measures implemented at Hoover Dam after 9/11. It hasn't existed since the Hoover Dam Bypass project was completed. So this one doesn't really count, despite the fact that it was around for 10-ish years.