Numbered Routes With Only 2 Lanes For Its ENTIRE Route

[STLmapboy]

The only one I know of for sure right now is MO-103.

Since the supplementary system is lettered, I will leave those out..

Also 46-mile long MO-123 west of Bolivar through Humansville and Weaubleau (which are incredibly fun town names btw).

[Bickendan]

OR 361, 370 come to mind (380 fails in Prineville itself).

[dvferyance]

There are many in WI but the longest one might be WI-131 at 79 miles. WI-80 is 176 miles long with only one four lane segment, which is in Platteville.

Many fmr routes are like WI-84 WI-99 WI-109 WI-123 WI-184. As far as current routes WI-68 WI-75 WI-101 WI-102 WI-105 WI-106 WI-111 WI-112 WI-118 WI-127 WI-134 WI-137 WI-155

[SteveG1988]

NJ59, NJ163, Maybe NJ413 if you don't count the toll booths along it and the turn lanes onto US130.

[jeffandnicole]

NJ 140 just misses the qualifications due to a 300 foot section of 4 lane roadway. This is all the more incredible because the road has intersections with 2 US routes and interchanges with 2 highways, yet all but 1 of those ramps don't have accel/decel lanes nor turning lanes.

[Roadsguy]

The closest to me is PA 341, but it's only 10 miles long. PA 17 also qualifies at 35 miles long. I'm sure Pennsylvania has more examples, but these are the two I've found so far.

[Dirt Roads]

VA-48 technically counts and is 323 miles long, but it's unsigned.

In this same vein, WV-150 (Highlands Scenic Highway) is all two laned.

Similarly, WV-66 in and out of Cass remains two lanes.

[webny99]

There are not a lot of New York examples. NY 262 (17 miles in length) is the only one I can find, but it qualifies in style, complete with a multiplex!
Any other examples that qualify even with a multiplex?

[oscar]

Another candidate: ~ 100 mile-long Nevada 375 (Extraterrestrial Highway), passing near Area 51. No turn lanes at either end, or its one community/tourist trap Rachel, or the Alien Research Center near the south end.

[Scott5114]

Oklahoma may have a higher number of these than other states, since they have a tendency to use slip ramps for right-turning traffic, rather than turn lanes, at major highway junctions. We also have a lot of short connector highways. Just sticking to McClain County, OK since I know those: SH-74B, SH-130, SH-24, SH-133.

[briantroutman]

If any examples exist in Pennsylvania, I assume they'll be relatively short, low volume state routes in rural areas that do not serve a significant purpose as through routes.

On a hunch, I checked out a route that I mentioned in the Signed state routes that dead-end thread: PA 660, which primarily serves to connect US 6 to Leonard Harrison State Park. It appears to qualify. Through PA 660 is signed along Wellsboro's Main Street, it avoids having any turn lanes, at least in part due to the width of the street and its function as a pedestrian-oriented shopping street. PA 660 very narrowly avoids having a turn lane, too, as the section of Main Street immediately north/east of Queen Street (which is part of US 6) has multiple turn lanes–befitting the more auto-oriented business in that stretch (supermarket, motels, gas station). Traffic volumes are low enough that where PA 660 makes a 90-degree left turn west of town diverging from PA 362, no turn lane is provided.

Any other examples that qualify even with a multiplex?

From the example above, PA 660 is co-signed with PA 287 in Wellsboro.



Another that appears for work is PA 554, a winding mountain road that connects US 15 in South Williamsport to the sparsely populated valley south of Bald Eagle Mountain. Traffic volumes are low: AADT is about 1,100 near South Williamsport and only 600 at the southern end (before it makes a 90-degree turn onto Elimsport Road to make the connection to PA 44).

[ozarkman417]

The only one I know of for sure right now is MO-103.

Since the supplementary system is lettered, I will leave those out..

Also 46-mile long MO-123 west of Bolivar through Humansville and Weaubleau (which are incredibly fun town names btw).

That depends... would the distance traveled on the MO-13 expressway, as a result of a J-turn, disqualify it? I believe I can add MO-104 to the list.

[STLmapboy]

The only one I know of for sure right now is MO-103.

Since the supplementary system is lettered, I will leave those out..

Also 46-mile long MO-123 west of Bolivar through Humansville and Weaubleau (which are incredibly fun town names btw).

That depends... would the distance traveled on the MO-13 expressway, as a result of a J-turn, disqualify it? I believe I can add MO-104 to the list.

There doesn't appear to be a J-turn at 13/123.
https://www.google.com/maps/@37.7641855,-93.5592066,367m/data=!3m1!1e3

[ozarkman417]

The only one I know of for sure right now is MO-103.

Since the supplementary system is lettered, I will leave those out..

Also 46-mile long MO-123 west of Bolivar through Humansville and Weaubleau (which are incredibly fun town names btw).

That depends... would the distance traveled on the MO-13 expressway, as a result of a J-turn, disqualify it? I believe I can add MO-104 to the list.

There doesn't appear to be a J-turn at 13/123.
https://www.google.com/maps/@37.7641855,-93.5592066,367m/data=!3m1!1e3

That must be outdated imagery. MoDOT installed a bunch of them along MO-13 between Springfield and Clinton a year to a year and a half ago. I use the J-Turn at MO-123 every month or so.

[Dirt Roads]

This is harder than I ever imagined.  Given the coal truck traffic, even some tiny roads in West Virginia like WV-97 have been upgraded with truck lanes in a few places.

[STLmapboy]

The only one I know of for sure right now is MO-103.

Since the supplementary system is lettered, I will leave those out..

Also 46-mile long MO-123 west of Bolivar through Humansville and Weaubleau (which are incredibly fun town names btw).

That depends... would the distance traveled on the MO-13 expressway, as a result of a J-turn, disqualify it? I believe I can add MO-104 to the list.

There doesn't appear to be a J-turn at 13/123.
https://www.google.com/maps/@37.7641855,-93.5592066,367m/data=!3m1!1e3

That must be outdated imagery. MoDOT installed a bunch of them along MO-13 between Springfield and Clinton a year to a year and a half ago. I use the J-Turn at MO-123 every month or so.

Well then the base map doesn't have it right either.

[Dirt Roads]

Technicality:  the various sections of WV-102 are only two lanes, but Virginia's sections of VA-102 include several sets of truck lanes and the southern terminus of College Avenue at US-460 in Bluefield (Virginia) is multilane divided.  Even WV-161 along the Virginia line west of here has several sections of truck lanes.

[DJDBVT]

MA 142 (VT 142 almost - it's northern end has a right turn lane to VT 119)

At one time, there was a marked left turn lane on MA 142 SB at Bennett Brook Road. It now appears to be unmarked, though the SB lane remains extraordinarily wide approaching the intersection. More Massachusetts weirdness.

Add to the list:
VT 25A
VT 25B
VT 26
VT 35 (maybe? Two two-lane legs at VT 30)
VT 44A
VT 121
VT 123 (again maybe, with two two-lane legs at US 5)
VT 244

[JKRhodes]

Forgot Arizona SR 366, and it's right in my back  yard. (d'oh!)

34 miles, not a single turn lane or passing lane along its entire length. Thankfully it does have the occasional wide spot in case your passengers are prone to carsickness.

Arizona 78 and its NM counterpart, NM 78, similarly cover a length of about 34 miles between US 191 and US 180.
The only part wider than two lanes is at the western terminus, where it has a turn lane to match the other three legs of the intersection.