zillow.com addresses

I actually found the link here: http://www.hyd.gov.hk/en/road_and_railway/existing/index.html
It's last review date is 14 Apr 2015 (very update)!
Again, benefit of the doubt again.

I'll change the whole thing later when I have time

I didn't zoom in close enough when retagging.

The Tsing Ma Control Area (along with Discovery Bay Tunnel, which is not even a dual carriageway) is listed under highway=motorway.

osm.wiki/HK:Hong_Kong_tagging

Since both documents are OFFICIAL AND CONTRADICTING, isn't it like contradicting laws? In this case, we should take the benefit of doubt, so Ma On Shan Bypass should be tagged as highway=motorway.

You check in Google Street View to see if things are correct?

You check Google Maps to see if things are correct?

The first link is from the government, so it's reliable.

It is because the trunk roads Lung Cheung Road and Kwai Chung Road don't have blue distance marker signs.

jc86035, doesn't having blue distance marker signs make a road a motorway?

Cheung Pei Shan Road is a motorway as it has the blue distance markers on the roadside. Also, the westbound onramp from Tsuen Kam Interchange has a motorway sign.

Tsing Yi North Coastal Road is located in the Tsing Ma Control Area. Since the Tsing Ma Control Area should be classified as a motorway, all roads part of it should also be a motorway.

Ok, I just read the links. I also saw motorroad. Then I will suggest OpenStreetMap to create a "motorroad" road type.

A1(M) at Peterborough is tagged as a motorway

A road need not have green signs or government designation to be a motorway. Look at these links, they call Gloucester Road a motorway, which I do agree.
https://www.tvnz.co.nz/one-news/world/rush-for-cash-after-van-spills-banknotes-on-hong-kong-motorway-6211539

http://www.mirror.co.uk/news/world-news/its-raining-cash-christmas-comes-4873052

It doesn't have to have a green sign to be called a motorway, more properly a controlled-access highway. As long as a road has a central divider or median, has no intersections, has no pedestrian crossings, and has no curbside sidewalks, it can be called a motorway or freeway. Now, Lung Cheung Road does have sidewalks, however, they are separated from the road, that is, pedestrians cannot accidentally step into the street, so it is still a motorway.

https://en.wikipedia.org/wiki/MEMU

Fare systems or speed does not matter.

The Airport Express is not intercity, therefore, it is a subway.