1. osm.wiki/JA:Key:building:levels You can use building:levels= to count the number of floors, without adding building:height= directly. Both are used in 3D renders, eg https://osmbuildings.org/ and https://demo.f4map.com/ (and other applications).
2. osm.wiki/JA:Key:lanes More convenient to add lanes= at first, but measuring width= on GSI map is also easy (especially for https://wiki.openstreetmap.org/wiki/Tag:lane_markings=no).

You can ask questions on OSM Help.

website= would link a general page/tab in a website, perhaps showing basic info and route. To explicitly to link some particular info (especially on different sub-page / tabs), better use *:url=. There’s already opening_hours:url=, and it’s not a different website. Eg interval:url= if needed.

https://wiki.openstreetmap.org/wiki/Tag:departures_board=delay actually means the headway/interval to show service frequency, not disruption delays. Mistranslation in the original.

@H@mlet
On the other hand, I don’t want to disable too many roads during daytime. I do use the “most of the time” criteria with deciding motor_vehicle= default =yes or =no. In this case, it’s nighttime and on weekends.

@xyzl It’s not Tagging For Router if it is correct data. (Moreover many renderers only considers access=)

For visibility, ask questions on OSM Help. Diary is more for showing your thoughts or solution. Not as many read this I assume.

You need to know comma and semi-colon have different meanings. Simplified explanation: , is for additional rules; ; for overriding rules.

The correct tag could be https://wiki.openstreetmap.org/wiki/Tag:motor_vehicle:conditional=no @ (Fr,Sa, PH -1 day 20:00-24:00, Sa,Su 00:00-05:30; PH 00:00-05:30). The critical difference is =*, PH -1 day 20:00-24:00*. Verify https://openingh.openstreetmap.de/evaluation_tool/?EXP=Fr,Sa, PH -1 day 20:00-24:00, Sa,Su 00:00-05:30; PH https://wiki.openstreetmap.org/wiki/Tag:00:00-05:30&lat=51&lon=0&mode=0&DATE=1650020460000 (set to England on Good Friday) by playing around with the date and syntax.

That’s a long discussion for a diary. I will simply mention one of my recent observations on angled intersection geometry: Make a right-angle by considering a perpendicular line normal to the give-way / stop / signal line (as a tangent).