NOTICE: help.openstreetmap.org is no longer in use from 1st March 2024. Please use the OpenStreetMap Community Forum

Why does not Mapnik render highway lanes? There is a great inconsistency about what highway=trunk means... sometimes it is used for single lane roads (mostly in United Kingdom) and sometimes it is used for say 2nd grade motorways (multiple lanes, continental western Europe for instance). If we rendered highway lanes, this inconsistency would disappear.

asked 12 Mar '14, 21:32

Kozuch's gravatar image

Kozuch
1.7k587285
accept rate: 8%

closed 14 Mar '14, 13:04

Richard's gravatar image

Richard ♦
30.9k44279412

The question has been closed for the following reason "This is a feature request phrased as a question, not a request for help" by Richard 14 Mar '14, 13:04


I think you should talk first with the UK community and check with them why "trunk" seems inconsistent. It is possible that locally someone made a mistake about the "trunk" class.

The "highway=trunk" is also used differently depending on the country. Here is a table showing the international equivalence of the "highway" tags.

You can contact the UK community through this dedicated mailing list (needs subscription).

Here, in short, I can only provide some generality : the "highway" class reflects its importance in the road grid. Usually the amount of lanes is related to this importance (more traffic=more lanes). We can expect that the amount of lanes is greater in motorways than in residential streets. You might find some exceptions but then, it should be carefully verified and see if it is not simply a mapping mistake.
The rendering styles currently use the "highway" class to set the colour and line width. It's not using the tag "lanes=" or "width=", excepted perhaps for the very high zoom levels where these attributs can really impact the resulting images.

permanent link

answered 14 Mar '14, 11:01

Pieren's gravatar image

Pieren
9.8k2083157
accept rate: 15%

Lanes=<value> should only effect the width of the road based on their default lane width. And if possible you can add width=<value> and width:lanes:[forward/backwards]=<value>(“|” divider if needed)<value> for overriding the lanes default width. The lanes or the better option of lanes in conjunction with the width, should be the only thing rendered. This would fix a lot of visual understanding of roads in open areas or visually and statistically knowing if you can use the roads in tight spaces.

(10 Jan '18, 20:30) Mxdanger

Follow this question

By Email:

Once you sign in you will be able to subscribe for any updates here

By RSS:

Answers

Answers and Comments

Markdown Basics

  • *italic* or _italic_
  • **bold** or __bold__
  • link:[text](http://url.com/ "title")
  • image?![alt text](/path/img.jpg "title")
  • numbered list: 1. Foo 2. Bar
  • to add a line break simply add two spaces to where you would like the new line to be.
  • basic HTML tags are also supported

Question tags:

×440
×163
×53

question asked: 12 Mar '14, 21:32

question was seen: 4,135 times

last updated: 10 Jan '18, 20:37

NOTICE: help.openstreetmap.org is no longer in use from 1st March 2024. Please use the OpenStreetMap Community Forum