Hi, yeah deleting the non-existent road is fine. It looks like you deleted part of the private road; if you could add that back in that would be great. Thanks!

If they are simply private roads, they can be tagged as such. Private roads are still mapped.

I'm not sure about this changeset, but you know what he's referring to. If you want to not split road ways around pedestrian islands that's fine, but it is unacceptable to go around "simplifying" and deleting detail that has already been added by other people, when it is an agreed correct way of mapping.

All the discussion I have found on the internet indicates that roundabouts adopt the speed of their road, they do not "break" the dual carriageway, they are not their own "singular circulatory carriageway". So if a roundabout is not 70mph, it would be because it has arms with lower speed limits, not because of the reasoning Nathan put forth.

One way the consensus can be revealed to you is by opening overpass turbo, having a look at the UK and running this query:

[out:json][timeout:25];
nwr["junction"="roundabout"]["maxspeed"="70 mph"]({{bbox}});
out geom;

Have a look around and observe the numerous roundabouts on dual carriageways, such as motorway junctions.

That's a good way of thinking about it. At a tangent to you there is an opposite carriageway. Regardless, there is no debate about this. The consensus is crystal clear that the roundabout has the same speed limit as the road it is part of. So I have set the speed limit of the roundabout back to 70mph and change it from nsl_single to nsl_dual.

You say it's true for slip roads and not for roundabouts. Why? What's the difference? The only one I can think of is that a roundabout is circular.

The roundabout is part of a dual carriageway. It has the speed limit of the road it is part of. Practically, the NSL continues to be 70 on single carriageway sections of road where there is no oncoming traffic, like a roundabout or a slip road. So, this change is incorrect. If you were right here, you would have your work cut out for you changing it across the whole country.

It looks you just deleted the `building` tag, and the change description doesn't make sense.

Where does the name Streamside come from? Is this area not all Whitnash Brook? There's a note open that seems to be about this.