1) It would be beneficial to leave as there is no way of determining whether this is 50mph or NSL due to lack of signage at either end. Likely NSL, but needs confirmation from the council.
2) This is more likely a missing case of NSL repeaters, as I remember there being no speed limit signs around the roundabout on the A24. Again, this likely needs contact to the council about missing signs rather than assuming it is 30mph.
3) This is incorrect. The A24 is a dual carriageway throughout, despite the large gap between the carriageways. The 60mph signs (not NSL) southbound confirm this, as do multiple blue circular arrow signs with a plate reading "Dual carriageway"

Thank you for going through these. I thought it disruptive.

This is not a dual carriageway. Do not split ways like this please.

As much as this is nice information, are you sure this can be added given it's a system that has long been removed?

Best to check what each answer to that quest actually does, might help you with determining which one to pick.

Are you sure this road is 60 mph?

That refers to proper dual carriageways, whereas in this case the road is just separated by traffic islands

I already fixed the tags here

Are you sure the signs are not incorrect or out of date? Do not trust signs alone. It is highly unlikely this road is trunk to the city centre when the M6 bypassed the city decades ago. I am reverting this for now unless proven otherwise.

You clicked the 30 mph ZONE option, not a 30 mph speed limit. 30 mph zones do not exist in the UK

I already did, and they added a "are you sure?" popup when adding a 30 mph zone. Did you see it?

maxspeed:type=construction is not a valid tag

Hi, 'maxspeed:type=GB:zone30' is not a valid tag. If the road is lit and has a 30 mph speed limit, use 'maxspeed:type=GB:nsl_restricted'. If the road is unlit and has a 30 mph speed limit, use 'maxspeed:type=sign'

A reminder that 'maxspeed:type=GB:zone30' is not a valid tag

AND osm.org/way/46463934#map=15/51.0056/-0.3420? Is this the national speed limit or a signed 60 mph limit like the other carriageway?

Are you also sure osm.org/way/973553914 is 30 mph? I don't remember that last time I went along here

Can you verify the maxspeed on osm.org/way/455836336#map=18/50.98767/-0.34098? One end bounds the 50 limit, the other the 60 limit. I couldn't see any signs at either end last time I drove to Knepp.

That page clearly states "roads are *not* to be mapped as dual carriageways if the two directions are only separated by paint" - this is exactly the case for a part of this road.

Why did you split this road into two-one-way ways where it was previously a single way? Do not split ways in two unless there is a physical divider.

I've changed to a more suitable service road, but left access tags as I can't tell if it's private or customers only as I can only see determine that on the ground.