You may like to read this: osm.wiki/Beginners%27_guide

[Correction: "may have to be removed" should be "your uploaded changes may have to be removed".]

I can't stress this enough, but you should NEVER copy information from copyrighted maps without permission for commercial use from the dataset's owner. It is against the OSM rules, would otherwise violate the project's license (ODbL) and – if you have done this for all your changesets – may have to be removed.

This is almost definitely in the wrong place. 這差不多一定是在不正確的位置。

Why did you tag a reservoir as a building?

It's probably best to use minibus. Maybe ask help.osm.org or make a formal tag proposal? It's not so useful if it's not rendered or in JOSM presets.

Thanks :)

To 小智智: To confirm, should `psv=bus` be changed to `bus=designated` and `psv=gmb` be changed to `minibus=designated`? (Red minibuses, if any, would probably be `share_taxi`.)

Isn't the area under the bridge part of the Mainland?

These tracks should not be tagged as disused, as they are still actively maintained by the MTRC in case of service disruptions on the Tseung Kwan O Line (see https://en.wikipedia.org/wiki/Kwun_Tong_Line#History).

Or, more logically, you could go with whatever is on the road signs that are *actually there* if there's a conflict between two sources.

This link is probably inaccurate and/or outdated. http://www.td.gov.hk/mini_site/hksrens/2008/EN/RouteMapL-R8.htm shows that, as signposted, route 8 ends at the end of the bridge between Tung Chung and Chek Lap Kok (at kilometre post 0). (However, both the expressway and the "route 8 end" sign are on the other side of the bridge.)

Probably inaccurate and/or outdated. May have had its trunk route designation removed when route 9 was created in 2006. http://www.td.gov.hk/mini_site/hksrens/2008/EN/RouteMapM.htm does not give this road a route number and it is not an expressway, so it should be highway=secondary.

Does the tunnel area begin after the gas station? I think it only ends on the southbound carriageway there but it starts on the bridge over route 7 northbound.

Discovery Bay Tunnel is currently highway=secondary, so I'd say the wiki page isn't all that accurate. Try messaging KX675 (writer of the wiki page).

If you're going to change it, at least change the whole thing instead of doing it inconsistently.

I don't know, honestly, I got corrected when I did this once so it's probably incorrect. The tunnel area probably starts on the eastern side of the exit.

The "control area" designation is entirely separate from the "expressway" classification and so since North Coastal Rd is not in the gazettal it should be tagged highway=primary or highway=secondary.

Why did you leave the end of the road highway=motorway?

The EPD document is from 2004 and states "will be gazetted". The Highways Department document is a later document voiding the designations in the previous gazette from 1 December 2009, which presumably voided the ones in the previous, and so on, so if it was an expressway at its opening it isn't one anymore. (One badly-scanned PDF from 12 years ago is not really a good source for the question "Is this road an expressway?".)

I'm not sure what definition of "highway" you have but every single road listed in http://www.gld.gov.hk/egazette/pdf/20101448/egn201014487570.pdf is signed all over the place with green signs and kilometre markings, and has "expressway begins" and "expressway ends" signs (see https://commons.wikimedia.org/wiki/Category:Diagrams_of_road_signs_of_Hong_Kong) at every entrance and exit. Ma On Shan Bypass is not one of those roads.