traffic_calming=island

[HolgerJeromin]

I want to discuss rendering of traffic calming islands.
Islands at a junction or end of a road could render like a miniroundabout, but in a normal way this would be missleading.

[matkoniecz]

I am not entirely sure is it a good candidate for rendering.

[mboeringa]

To be honest, I think it would be far better to include such detail as part of area:highway=x rendering, which actually has its own tag for this (area:highway=traffic_island). This type of detailed features of just a few meters is really only suited for large scale rendering (>= 1:2500 or so).

[HolgerJeromin]

My concern is primary about the really "large" mini_roundabout like thing. It is nearly the same as a mini_roundabout or turning_circle, but without a sign in the middle.

I am with you, that the island in a normal way should not be renderd.

[HolgerJeromin]

Should we have another tag to be able to differ these two?

[matkoniecz]

mini_roundabout or turning_circle, but without a sign in the middle.

Note that mini_roundabout and turning_circle does not require "a sign in the middle".

[HolgerJeromin]

http://wiki.openstreetmap.org/wiki/Tag:highway%3Dmini_roundabout has a table of images. One entry is:
"Don't let the island confuse you: there are indications neither of a one-way nor of right-of-way, so this is just a junction with an island used for traffic calming."
exactly the situation of my examples.

[Tomasz-W]

By now there are about 25k traffic islands on map:
https://taginfo.openstreetmap.org/tags/traffic_calming=island
https://taginfo.openstreetmap.org/tags/area%3Ahighway=traffic_island

I would like to show some examples how incomplete street looks without island rendering, comparing certain places on OSM to an area:highway visualisation with islands rendered:

http://www.openstreetmap.org/#map=19/52.39040/16.96688
http://osmapa.pl/w/area/?lat=52.39047&lon=16.96692&zoom=19&ol=Qq

http://www.openstreetmap.org/#map=19/52.39354/16.96366
http://osmapa.pl/w/area/?lat=52.39334&lon=16.96391&zoom=19&ol=Qq

http://www.openstreetmap.org/#map=19/52.39380/16.95808
http://osmapa.pl/w/area/?lat=52.39388&lon=16.95834&zoom=19&ol=Qq

[kocio-pl]

I've just tried to add the code for it, but roads are very complex issue in this style, so I may try again later. Could anybody help me with that?

[matthijsmelissen]

Exactly why I proposed keeping v3 compatible with other osm2pgsql stylesheets - unfortunately @pnorman disagreed. We could still consider reintroducing compatability at v5.

[kocio-pl]

@math1985: Looks to me like a comment to another issue (#2666 (comment) probably)?

BTW: Adding tags->'traffic_calming' as traffic_calming, to highway-area-fill layer works only when there's a highway=* tag, but not when there's only traffic_calming + area=yes. SQL expert is needed... 😄

[SomeoneElseOSM]

Just a thought, but now that lua is available (notwithstanding the v3/v4 discussion) surely it'd be a lot easier to consolidate features there rather than adding yet more complication to the existing SQL? It would mean that existing "traffic_calming" wouldn't get rendered until they're modified or the database is reloaded, but in the case of a simple feature add this is less of an issue I think.

[kocio-pl]

We have no plans for next database reload, however it seems that we would wait about 6 months (see #1286), so it can help only with big features.

[Tomasz-W]

Just for the note: color used in visualitation from my comment above is #bebebe , but as we will need some gray shade to distinguish cycleway areas from footway areas someday in future, I would left this colour for cycleways, and use #d9d9d9 (it's a shade between visualisation colour and current footway fill) for traffic calming islands.

Is anybody interested in writing code for this issue?

[Adamant36]

Any idea how this should be rendered? are we going with both traffic_calming=island as a point on the road and area:highway=traffic_island as a separate area or are we favoring one over the other? I could see the advantages and disadvantages of both. There's currently 7,383 uses of area:highway=traffic_island and 25,689 uses of traffic_calming=island. Traffic_calming=island is clearly the more popular tag. It seems as though uses of area:highway=traffic_island are petering out, while Traffic_calming=island is growing rapidly.

[Tomasz-W]

@Adamant36 As we don't support area:highway=* key at the moment please include only traffic_calming=island. Rendering of traffic calming nodes/ linear ways would propably cause mess on roads, so I mean only areas with #d9d9d9 fill.

[jeisenbe]

Several comments above suggest that this is not a good candidate for rendering, unless area:highway was also rendered at high zoom levels.