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[jeffandnicole]

Streets with parallel parking are not automatically one-lane streets.

Streets with no center striped are not automatically one-lane streets.

I wouldn't think they normally are.  Near every development has roads that permit parallel parking on the roadway, and are rarely striped.

[Takumi]

Helen Avenue

[epzik8]

A small portion of Norman Avenue in Aberdeen, Maryland is one-way, if not one-lane.

The service road parallel to US 40 westbound a short distance away is one lane but with parallel parking.

[J N Winkler]

I consider a road to be one-lane if it is narrow enough that two vehicles coming from opposite directions cannot comfortably pass at speed.  This is the crucial operational distinction.  Whether two vehicles can squeeze past each other very slowly, or one needs to reverse to a passing place, is merely a choice between two different levels of disaccommodation.  In the field, it can be difficult to tell the difference between the two since such roads are often not properly "made" in the sense that they are engineered with and maintained to an uniform cross-section.

The nearest one-lane primary state highway to me is probably NM 503 near the Santa Cruz Reservoir.

[cl94]

The nearest one-lane primary state highway to me is probably NM 503 near the Santa Cruz Reservoir.

How the heck is that a primary state route? Oh wait, New Mexico, never mind.

I remember the unpaved segment of VT 121 being of similar width in places; that might be my closest one-lane state-numbered road that isn't a bridge if we're using "must slow down significantly to pass" as the threshold. Note that this, along with the similarly-sketchy unpaved section of VT 58, is town maintenance.

[Dirt Roads]

It's been a long time since I lived close by, but the following post from PennDOT via 74/171FAN reminded me of this one that I've been on in Southwest Pennsylvania:

PennDOT - District 12 News: Route 4038 Layton Tunnel and Bridge Closure

I can't believe that the Layton Bridge/Tunnel was still open to traffic, or that PennDOT is even going to try to rehab the mess.  That railroad branch was closed back in 1931.

https://pabucketlist.com/exploring-the-layton-bridge-and-tunnel-in-fayette-county/

[CtrlAltDel]

The closest one to me, that I am aware of, is here:

[NWI_Irish96]

The IN 225 bridge over the Wabash River is one lane. That's the closest one lane road I know of that isn't a one-way city street.