I have in the past reported a turn restriction to Google. They fixed it in a fortnight. I guess it’s down to how busy the oompah loompahs are.

I found an article about Garmin’s map release schedule http://www8.garmin.com/updatemaps/, and the data comes from Navteq’s release schedule, which was quarterly. Tomtom, I don’t know, but there’s mentions of a nearly-quarterly release schedule http://discussions.tomtom.com/t5/XL-XXL-HOME/XXL-Map-release-dates/td-p/60597’ for whole map releases.

Not to mention that the Chinese authorities are rather suspicious of 'unofficial' surveyors.

http://www.telegraph.co.uk/news/worldnews/asia/china/4125477/British-students-fined-for-illegal-map-making-in-China.html
http://afp.google.com/article/ALeqM5hxOnJhPwqKlWlzTA_IayKjnVihSw
http://thenextweb.com/asia/2011/03/22/china-takes-down-illegal-online-maps/

Nope. Not there. At least not visible when travelling westbound along Gloucester Terrace onto Ranelagh Bridge.

And of course, there's no point in a local authority or other transport authority prohibiting certain traffic on paper only.

They have to make the restriction known according to legally prescribed signage. No signage showing prohibited traffic, therefore no prohibition. They cannot expect all road users to ferret around traffic orders in the bottom of a locked filing cabinet in a disused lavatory with a sign on the door saying 'beware of the leopard' just in case it mentions a traffic order affecting the road they might want to use. In this case, there are no such signs on the westbound direction. I agree, in the eastbound direction, there are signs.

In a similar fashion, controlled parking zone penalty notices have been quoshed when there hasn't been the correct signage on all possible entrances to the zone. In such cases, the default rules of the road with regard to parking apply.

Back to Openstreetmap, and we map features as they appear on the ground. Ground truth always wins.

@chriscf. Certainly no signs on the westbound entrances to the A40 Westway. I've checked the Marylebone flyover and Ranelagh Bridge entry. Ranelagh Bridge actually has signs saying no buses or HGV, but nothing forbidding cyclists or pedestrians. The only 'no cycling' signs near the Marylebone flyover are relating to the subway.

I never 100% trust OS Locator, there's far too many errors for my liking, hence there's quite a lot of not:name tags, especially with Welsh language spelling. Anyone would think that they were done by someone who didn't speak Welsh, and had never been there.

There are many places where there are no street names on the ground, and the only ways of finding out is by asking locals, or OS Locator. Any good research on this sort of thing uses multiple sources. The local character in the pub isn't always the wisest.

Looks like Silverstone needs some work in OSM, now that they've got the track layout quite different, and the new pits.

At the moment, it's a case of cross-checking one list against the other. Once we have that done, and we can match entries in the list with OSM node IDs, we can worry about tagging things like hire facilities, or type.

Is it not something silly like you have told your Garmin to avoid U turns and it interprets acute angles as such?

I've got the CRS 1.0, can't fault it. (Probably didn't need the higher spec, but I was in a comfort spending mood). First thing I did to it when I got it home was take all the lovely weight saving stuff that they put on the 1.0, and add the additional weight of mudguards, a rack, and so on, and stupidly powerful lights with a heavy battery pack (well, I sometimes ride home on unlit cycle tracks..) - but it does give me a 12V accessory socket I can use to charge my phone/gps/whatever.

well, since the area is still under development, I guess that landuse=residential is a bit of a misnomer. There's still plenty of mud and diggers around.

landuse=farm is once again something that can be heavily overused, especially when you get out of town, since much of the country would be covered in it. This area, being right next to Green Belt land, will have lots of landuse=farm around.

What I do tend to use is landuse=farmyard to denote the area of farm buildings, and occiasionally, I use landuse=farm to denote something out-of-the-ordinary, like city farms and so on.

I tend only to use landuse=residential for established, named areas (named housing estates, etc). At the moment, the development is going by the developer's project name of "Ridgemont", but these names barely ever get used once the last plot is sold - for instance, the road itself got named by the council as Morphou Road.

Once the diggers, concrete mixers and so on move out of the area, I'll get rid of landuse=construction

Many thanks to RichardF, who re-projected most of the Welsh NPE sheets to use in Potlatch. This corrects the worst of the alignment problems I was facing with JOSM and the NPE WMS server.

The online editor applet (isn't actually a Java applet any more - it's now called Potlatch, and is written in Flash) can use Yahoo's API to retreive aerial imagery, for which we are allowed to create derivative works. Sadly a bug in Yahoo's API also stamps the aerial photos with the copyright information for the roads layer (which we aren't using), which might imply the false information that the aerial imagery is sourced from Tele Atlas, or Navteq.