Author: progysm[at]gmail.com
[Added to the original trac issue at 6.03am, Thursday, 3rd March 2011]

We have the same problem in Quebec and Ontario and with others provinces since we can now import Canvec (official national data in osm format) data into OpenStreetMap.

Examples:
road #117 in Quebec : http://www.openstreetmap.org/?lat=46.674&lon=-75.182&zoom=10&layers=M
road #7 in Ontario: http://www.openstreetmap.org/?lat=44.533&lon=-77.36&zoom=10&layers=M
road in British-Colombia: http://www.openstreetmap.org/?lat=55.36&lon=-123.3&zoom=8&layers=M

Author: progysm[at]gmail.com
[Added to the original trac issue at 6.57pm, Wednesday, 23rd March 2011]

Example of trunk road with rgb: 697d61 dark green

Japan:
http://yansanmo.progysm.com/photos/ps/map/osm-trunk-darker-japan-zoom8.png

Hautes-Laurentides:
http://yansanmo.progysm.com/photos/ps/map/osm-trunk-darker.png

Author: Harry Wood
[Added to the original trac issue at 11.38am, Thursday, 9th August 2012]

I agree this is a problem. Mentioned on IRC today. It's particularly bad at zoom levels <10 when there is no casing rendered. e.g. [http://www.openstreetmap.org/?lat=35.029&lon=132.556&zoom=11&layers=M here in Japan at z11] the green roads a pretty much invisible at the moment.

progysm suggests making trunk roads darker, which might work, but we don't want them a yucky dark bottle green colour. Making landuse colours paler would also help. I reckon the map would look better if all landuse had lighter less powerful colours.

Author: Shoorick
[Added to the original trac issue at 11.32am, Friday, 16th November 2012]

!OsmAnd http://osmand.net/ draws trunks with red-violet color #de1042 (OSM Vector Maps, Day mode). These trunks are visible in forest, even during driving.

See http://osmand.cz/wp-content/gallery/novinky081/screenshot_2012-07-17-12-48-19.png (large screenshot with trunk, 7201280 pixels)

Samples of colors from this style:

 #ffffb5 yellow for tertiaries 

,

 #ffd6a4 orange for secondaries 

,

 #ef9a9c pink for primaries 

,

#de1042 red-violet for trunks 

,

 #a58efd blue for motorways 

and

 #c5f6c5 green for wood 

Maybe this red-violet is good for trunks in Mapnik too?

Author: Richard
[Added to the original trac issue at 12.44pm, Tuesday, 26th November 2013]

"I compare the color scheme with some other (commercial) and no one seems to use green for highway"

You mean apart from Ordnance Survey, Mapquest, and ViaMichelin, all of whom use green for UK trunk roads (I just checked)?

Author: pdorange[at]mac.com
[Added to the original trac issue at 5.57pm, Tuesday, 26th November 2013]

Replying to [comment:6 Richard]:

"I compare the color scheme with some other (commercial) and no one seems to use green for highway"

You mean apart from Ordnance Survey, Mapquest, and ViaMichelin, all of whom use green for UK trunk roads (I just checked)?

I've not checked all commercial maps around the whole world, i just said "some other ... no one seems" ; but i just also checked and MapQuest and ViaMichelin use red for highway for France map. And yes, around London they use green but i also note that forest in a very light green and highway remain very visible, no problem.

The problem a initially describe is a visibility problem between highway and forest, not a green problem.

) and they do they display forest in a very light green, so red on light green is very visible, no problems.

For France : http://mapq.st/IfvH3J

Author: math1985
[Added to the original trac issue at 9.47pm, Monday, 5th May 2014]

This issue is now being discussed on Github: gravitystorm/openstreetmap-carto#102
Therefore, I will close the issue here.