Looking at some intersections in Google Street View shows the green blade of a street name, not the square beehive of a numbered highway. This leads me to believe that yes, this is a street named "Old Highway 91", and as such, putting the name into a "ref=" tag would be incorrect.

This is a very common pattern in the western United States: a highway or highway routing gets decommissioned and turned into an ordinary road with a name of "Old Whatever Highway".

Since it's highly visible and heavily used, it should be mapped as a path in accordance with the "on the ground" rule.

Since it's not an official trail, tagging it as informal is appropriate; if there's some sort of "do not use" sign at the lower end, setting it as "access=no" is also a good idea.

Is there a reason why you re-tagged way/499601425 as a "closed:highway=path"? The upper end certainly looked open this afternoon, with no sign of being brushed out at either the summit or the intersection with Antoine Summit Alternate.

Additionally, the Strava Heatmap suggests it's a heavily-used path.

There were three issues that I fixed:

1. Way way/1304671097 met way/1304719438 one node away from the end. This is the mistake that broke rendering on the OSM website.

2. The way way/807023986 intersected itself twice. The renderer for the OSM website can handle this, but others can't.

3. The way way/1293734411 didn't have a role. This keeps this specific way from rendering, but won't break the rest of the relation.

JOSM has much better QA tools for spotting relation errors than iD does, though it's also considerably harder to use.

I'm not sure if that one's still there. Two years ago, I couldn't find the upper end, but I was pretty tired and low on water, and wasn't looking too hard. It was certainly there eight years ago when I first added it to the map.

Where did you get the name for "Peaceful Pines Lane" from? I hiked past the eastern end yesterday, and didn't see either a name or any indication that access (other than perhaps hiking) is permitted.

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These areas may be parts of a park, but they are not themselves parks as OSM understands the concept. Changeset has been reverted.

My best guess is the name came from a historical map. Back before the era of numbered state and US routes, long-distance routes were named. "Sunset Highway" was the primary Spokane-to-Seattle route.

There's no really good way of doing this. The most common is to use the postal city in the "city name" field when adding addresses.

I've reverted your recent changes. Cemeteries, forests, meadows, and nature reserves are not the sort of thing that OSM considers a park.

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