1: There were indeed some gratuitous GPS artifacts, and I've corrected those. However my photos do indicate that paths aren't entirely symmetric. For instance, the outer crossing of the Bar Hill exit has a strange cut-out from one corner that's missing from the others. I don't think we can do much better without aerials.

Thanks; that allowed me to find a couple of the other boundaries of the weight limit. Even if it were OK for copyright purposes, I wouldn't trust the accuracy of that map. For one thing it says there's a 3t weight limit in central Cambridge and while there are traffic regulation orders to that effect I've never found any sign of it on the ground.

Removing "porters" from each of these entrance= tags caused the porters' lodges to stop being marked on the University Map. I've made them entrance=main;porters, but is there a better way we should be tagging "this entrance leads to the porters' lodge"? I suppose more generally, "this entrance is staffed" -- College-specific terminology isn't really necessary here.

Has this building really been demolished? I ask because that's what completely removing the way (including the building=yes tag) means.

Yes; that's one of the government sources I referred to. The "Addresses" layer of My Cambridgeshire, which I think comes from the National Address Gazetteer, says that the street name precisely follows the parish boundary, so the American cemetery is on St Neots Road, Madingley, but Coton Court and Blue Gates opposite it are on Madingley Road, Coton.

As you suggest, using those as a source might be a bit dubious, so the source I actually used was the Web sites of various places along the road (cemetery, Madingley Mulch, Woodfield House, Rectory Farm). All of them call the road "Madingley Road". In the absence of signs I think that's the nearest thing to an on-the-ground name that we have.

Incidentally, Royal Mail also goes for "Madingley Road, Coton" for the whole length, but the postcodes split precisely on the parish boundaries.

I cycled this section today, and your new alignment was a perfect fit for my GPS track. I wasn't paying attention to what the A14 slip was doing, though.

Note that above I confused "inbound" and "outbound". It's the inbound carriageway that's closed, and the outbound one is being used for two-way traffic.

Sorry about that. Happily I don't think the difference actually affects anything in this edit: all the building sites that I tagged are still building sites in the newer imagery.

May I ask why you made this edit? The Avenue was connected to the A1307 when I surveyed it earlier today, and when I was out that way last weekend. Anyway, I've reconnected it now.

What's going on here? You've mapped an additional road precisely along the line of The Avenue. What change on the ground are you trying to represent?

Does this exist on the ground now? It wasn't obvious at the eastern end when I was out that way on Thursday.

FYI, I just cycled along the road from Dry Drayton to Oakington and the change you mapped there hasn't happened yet: the new road up to the bridge is nowhere near finished. I'll revert the changes in this area.

If your purpose is different from that of "name", maybe you should use a different key. osm.wiki/Key:name has a variety of existing options for different kinds of name. Alternatively you could use name:university_of_cambridge (by analogy with ref:university_of_cambridge) if you want a way to reference the University's name for something where that differs from the name marked on it.

Then I think the "map what's on the ground" principle on osm.wiki/Good_practice means we should use the name on the substation identity plate rather then the one in your database.

Hello. What's your source for this new name? I checked the plate on the substation gate on my way home and it still says "ROYAL GREENWICH OBSERV".

Did you really intend to map the Harston war memorial as the offices of Sphere Medical Ltd?

There's a sign next to each entrance to those paths saying "Private Grounds". I've added source tags to indicate this.

I visited Shire Hall today to check the County Council's records, and they believe that the entire parking bay, including the footway behind it, is part of the highway.

I've reinstated the tags, and added access=private which would seem to capture the intent behind these changes, and the situation on the ground.

I've roughly updated that, which turned out to be fairly easy.