Re: [Talk-gb-midanglia] Spagehtti junctions in Cambridge and St Ives
Apologies for the delay David - I've only just seen this. I agree, case 1 is way ott. Case 2 is also over complex. However, the roads here have been substantially widened and remodelled as part of the construction of the Green Acres and Slepe Meadow housing developments, so cannot be mapped from bing. Needs a survey. I have been in this area recently, but didn't survey the traffic lanes of the main road. Richard On 09 February 2012 at 22:23 David Earl wrote: > What do people think about mapping in the following style? > > In case 1 ( http://osm.org/go/0EQSJDPCX-- ), like many traffic lights > there are some central traffic islands and the part between the two sets > of lights is indeed divided by a central reservation so the NW-SE > section is justifiably dual, but not the other Mount Pleasant or > Victoria Road / Histon Road approaches, at least not to anything like > the extent now shown on OSM. Here is Google SV looking NW from Castle > Street: http://bit.ly/xa9uMZ > > In case 2 ( http://osm.org/go/eu6_VC5Dc-- ) there are no islands > whatsoever (quite unusual nowadays at UK traffic lights, but then the > main road is are quite narrow). You'll have to look at the data to see > what's been done here, it's too close together to see on the map tiles > at zoom 18. Again on SV: http://bit.ly/zyWvaF looking east on Houghton > Road from just west of the Hill Rise junction. > > Personally, I think the former is too much, and the latter is not > correct at all and I am inclined to adjust them accordingly. > > There may be other examples like this I just haven't come across yet. > > David > > > ___ > Talk-gb-midanglia mailing list > Talk-gb-midanglia@openstreetmap.org > http://lists.openstreetmap.org/listinfo/talk-gb-midanglia ___ Talk-gb-midanglia mailing list Talk-gb-midanglia@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-gb-midanglia
Re: [Talk-gb-midanglia] Spagehtti junctions in Cambridge and St Ives
I've looked a bit further into disabled access to crossings, and raised it on the accessability mailing list, and found that there is a proposal to map crossing islands already (http://wiki.openstreetmap.org/wiki/Proposed_features/Traffic_island). After mailing about this, I then realized that it might be good to mark routes through a crossing (particularly for the type of traffic island which has two crossings onto it that aren't opposite each other); and someone on the accessibility list found that "crossing" is already used as a way as well as as a node. __John ___ Talk-gb-midanglia mailing list Talk-gb-midanglia@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-gb-midanglia
Re: [Talk-gb-midanglia] Spagehtti junctions in Cambridge and St Ives
On 9 Feb 2012, at 22:23, David Earl wrote: > the part between the two sets of lights is indeed divided by a central > reservation so the NW-SE section is justifiably dual, but not the other Mount > Pleasant or Victoria Road / Histon Road approaches, at least not to anything > like the extent now shown on OSM. If you look at the data in Potlatch with the Bing imagery, it appears to be traced pretty faithfully, at least as concerns the size of traffic island/distance between the carriageways on all approaches to that junction. It could be simplified perhaps, but on such a complex junction, there is value in having each possible route through the junction marked in full. Personally I would be happy with the general approach here. The one part I would look to modify is where Castle Street becomes Huntingdon Road, and the two dual carriageways suddenly meet at a single node (5313653). This looks ugly and doesn't reflect reality, so should be changed on both counts. > In case 2 ( http://osm.org/go/eu6_VC5Dc-- ) there are no islands whatsoever > (quite unusual nowadays at UK traffic lights, but then the main road is are > quite narrow). You'll have to look at the data to see what's been done here, > it's too close together to see on the map tiles at zoom 18. Again on SV: > http://bit.ly/zyWvaF looking east on Houghton Road from just west of the Hill > Rise junction. This does seem very OTT for the size of the junction. Personally I would change to just one way representing each road, joining them at a single node marked as a traffic light. That's my opinion, based on what feels about right to me. If there are any good guidelines that contradict me, I'm happy to stand corrected. :o) Tim ___ Talk-gb-midanglia mailing list Talk-gb-midanglia@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-gb-midanglia
