`service=` and `passenger=` has been gaining traction in `route=`. I don't see you have any valid reasons to remove them.

Can you explain why would you remove the language tags?

How is it used for through traffic by non-motor vehicles?

* `highway=service`

But given that this may possibly used by non-motor vehicles, `=residential` for now.

Ok I admit I jumped to the conclusion because I'm a bit reserved about `highway=busway`. Reason being these bus streets aren't as separated as general "busway"s, and they have other uses for pedestrians (and sometimes bikes or push carts). I support `service=busway` in general more.

"as on King's Road" is `motor_vehicle=destination`.

Further considering the road hierarchy in the "old" part of city:
A extreme example is Garden Rd / Cotton Tree Dr. They are important to the district only, not regionally. After thinking about up-ranking them to `=primary` before, I agree that with the long-standing status that `=secondary` is suitable.
DVRC E'b west of Jubilee St obviously service a distributor role in the district.
Morrison St and Rumsey St north of DVRC is its continuation to DVRW via Connuaght Rd W.
Cleverly St serves left-turn from Connaught Rd C into inner Sheung Wan.

Context link: osm.org/changeset/95582941 on "busway".

`service=busway` has some uses. Would you thus consider `highway=service` being appropriate?

There's no distinction of national (often `=trunk`) or lower administrative management and classification here. They should be classified by function.

As a comparison, on King's Rd:
`=secondary` is used for `motor_vehicle=yes`;
`=tertiary` for long sections of `motor_vehicle=destination`;
`=unclassified` or `=residential` (I tend to the latter) for a single segment of `motor_vehicle=destination`.
It's unconvincing to consider that the Queensway -- Jubilee St westbound lanes is as important the eastbound lanes up to Charter Rd. Similarly, the North-Sound streets in the area except Pedder St, as well as Lamberth Walk have been classified as `=tertiary`.
To highlight the usage of DVRC W-b for Bank St, and right turn into E-b from Ice House St on `PH`, `=unclassified` have been applied to them.
A `=service` could as high quality as "public" roads in an airport.

A "busway" is typically dedicated and constructed purposedfully. (which isn't the same as `busway=`). `highway=busway` is mostly intended for median or side busways, as far as full-on BRT.

"However in westbound this link is open for franchised buses only, and it is an very important link for buses going from Wan Chai to Sheung Wan." Please use other tags to indicate the importance of a road to other modes.

This is definitely not a busway either.

Even if you for some reason want this, how does this get the same `=secondary` as DVRC E-b, QRC, and others?

What's more, there's the tramway, and eastbound lanes of DVRC west of Pedder St. Its significance can already be reflected.

This is totally irrelevant. A bus-only road is considered `=service`, whereever it is. You have failed to distinguish the section of DVRC for right turn from Ice House St as well. If a `=pedestrian` or `=living_street`, etc, is important, we don't change it to something higher-rank either. For pedestrian or other importance, some other form of tagging should be used. This concerns general vehicles only.

No one in their right mind would classify this to be the same as Queen's Rd C, et al either.

No one in the right mind would consider a road for certain non-public vehicles only as a `=secondary`. This is even franchised bus only. A bus-only road or busway, and busy pedestrian roads can be `=service`, and `=pedestrian` or `=living_street` respectively. `=service` here means a certain function, not that it's non-public, non-important, or in a facility.