The road is also not in the next link's document, which is supposed to be an exhaustive list of every expressway in Hong Kong. Ma On Shan Bypass does not have expressway signage.

Thanks, was going to do this in cleaning up woodpeck/Frederik Ramm's reversion.

PLEASE don't delete connector ways in intersections like that because it messes up the turn restrictions. Search the OSM wiki about them.

The road signs there show that the expressway only starts 100m to the east of where the two carriageways converge to form four lanes with a divider, so the eastern end should be tagged as highway=motorway_link or highway=secondary.

Your first link is from 2004 and is not by the Transport Department, meaning it's not a reliable source for if a highway is an expressway. Detail could have been lost in translation.
As your second link clearly states, only the part of Ma On Shan Road at the intersection with Tate's Cairn Highway (i.e. the exit 7 slip roads) should be tagged highway=motorway_link or highway=motorway. Not the entire road.

The distance markers don't make the roads motorways. The government just adds them inconsistently to trunk routes, I think. In the last several years it has been according to whether a road is on this list http://www.gld.gov.hk/egazette/pdf/20101448/egn201014487570.pdf.

Cheung Pei Shan Road is not a highway for any of its length and is therefore (from exit 25A to exit 24C) tagged as highway=trunk.

As far as I'm aware this road is not gazetted as a highway and takes highway=primary.

Should be highway=trunk. A few months ago bbkwan incorrectly changed West Kowloon Corridor to highway=motorway and that has yet to be fixed

Incorrect; this road should be highway=trunk as it is a trunk road but not an expressway.

FYI the reason the situation currently looks so inconsistent is because user 00crashtest, for some reason, decided without any community discussion whatsoever to tag every road without an at-grade intersection as highway=motorway. I have asked [email protected] to revert this change, per https://help.openstreetmap.org/questions/47773/problems-with-mass-retagging-and-others.

Don't change the highway type of roads any more, please. That was settled 5 years ago. Do something more productive with your time. You are obviously capable of editing.

Are you just bad at English reading comprehension or did I waste half an hour trying to explain to you how expressways have a special classification?

Where did you find "motor road" in the links and what purpose would this road type have? I believe the current types (motorway, trunk, primary, secondary, tertiary, unclassified, residential) are sufficient already.

If you didn't click the link to the OSM Wiki page, please do. osm.wiki/HK:Hong_Kong_tagging#.E8.A1.97.E9.81.93.E5.88.86.E9.A1.9E_Classifications_of_streets

I forgot to mention the roads with the (M) suffix – these are parts of A roads which are classified by the government as having motorway standard. In any case, Hong Kong has a different system to the UK.

see changeset/36839404

OSM Wiki page: osm.wiki/HK:Hong_Kong_tagging#.E8.A1.97.E9.81.93.E5.88.86.E9.A1.9E_Classifications_of_streets

Per tagging convention, in Hong Kong, if a road is not classified as an expressway by the Government of Hong Kong and not part of a tunnel area, it cannot be tagged as a motorway (highway=motorway).

Any part of the Hong Kong Strategic Route and Exit Number System which is not classified as an expressway is tagged as a trunk road (highway=trunk).

For comparison, only M roads (e.g. M25) in the United Kingdom are tagged as highway=motorway and only A roads are tagged as highway=trunk.

All other important roads in both the UK and Hong Kong, regardless of if they are controlled-access roads or have sixteen lanes or whatever, are tagged as primary roads (highway=primary).

I know you have only been an editor for a week, but you have made a very large change to what has been the tagging convention for the last several years without any discussion.

Since it would take a lot of work for me to put the tags back together myself, I have emailed [email protected] and asked them to revert your classification changes, per discussion at https://help.openstreetmap.org/questions/47773/problems-with-mass-retagging-and-others.

OSM Wiki page: osm.wiki/HK:Hong_Kong_tagging#.E8.A1.97.E9.81.93.E5.88.86.E9.A1.9E_Classifications_of_streets

Generally, expressways in Hong Kong are distinguished by green destination signs and kilometre markings. Most of them are part of the route system, but two (Penny's Bay Highway and Sha Lek Road) are not.

Tunnels and tunnel areas are also tagged as highway=motorway. (In my nearly three years here I have yet to find out why, but I digress.)

Please don't re-tag trunk routes not classified as highways (i.e. with green signs), or not in tunnel areas, as motorways (highway=motorway). These roads should be tagged as trunk roads (highway=trunk).