freebeer
The original mapper appears to have used TIGER data for this some 9 years ago to draw the entire length as split, and is the german mapper I referred to in another Note who should still be familiar to the DWG and still occasionally contributes as an armchair mapper, probably.
I see a lot of problems.  The quality of that work does not match how OSM has developed with the passage of time (at least in areas I take as exemplary), and it reflects the available resources of that time and does not reflect the far improved aerial imageries (ESRI, Mapbox) that clearly depict the situation and location.
One thing preventing me from tackling the job, apart from knowing nowt about any details of road mapping, is so-called `Verkleberitis' or the gluing of the wooded areas to the linear road.  (I'm being deliberately provocative to trigger someone's Kibo-filter here, see changeset discussion elsewhere)
This is in theory not a big deal for an expert to work around with the proper tools, but I've learned Potlatch, and like the old saying about tricks goes, I'm too old a doggie to wrap what little remains of me brane around JOSM, not to mention these Handys of yesteryear which are now smartphones and do not resemble that warmth-giving ENIAC planted firmly in me brane.  Whatever happened to those good ol' wooden boxes with the crank on the side you had to give yer arm a workout in order to send a hearty current to awaken the patiently awaitin' operator girls, always friendly, whom I'd then order to connect me with the iceman?
Kids these days and their Pokémen...
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But that's neither here nor there.  It's clearly wrong as the detailed imageries with up to zoomlevel 22 native (if pixellated horribly) show, the curves today look like shite compared to my mapping standards with such resources.
Keep your conversations polite (plenty of examples of fellow mappers doing so with obvious vandals or spammers) and public in changeset comments that get widely read so that you won't be alone if you attempt to defend what you feel is right, know the details of what you are mapping, keep some modicum of respect for other people's work, attempt to show them the error of their ways and nodes and relations.
There are a lot of different ways to map things, and those change with time, but in all truth, I was put off from cleaning up obviously wrong wooded areas around Pittsburgh upon seeing them as simplified areas re-using highway and residential boundaries, and that's before I learned some Potlatch tricks that make  it possible yet still inconvenient to update them without deleting the whole thing.
That said, maybe I will go against my principles, learn the Automotive Way (do they allow them without a man walking in front waving a red flag now?), and attack some of these issues.
Or maybe I'll wait to see if the sun appears, and get some strong drink to persevere through such a task - never map sober when you don't know what you're doing if you want to get anywhere.
Advice may not apply to those not off their meds or who don't live in an alternate reality.