[Tagging] works_as_highway=primary

Colin Smale colin.smale at xs4all.nl
Wed Jul 29 13:14:59 UTC 2015

A better router might weight physical attributes such as lanes, surface and effective speed more prominently than heuristics based on logical stuff like administrative classifications and legal maximum speeds. Artificially manipulating the tagging to influence the results of routing algorithms is not the way to go - there is name for that... If the government say its primary, then it's primary, unless you want to replace that with subjective assessments.

On 29 July 2015 15:08:33 CEST, Andrew Guertin <andrew.guertin at uvm.edu> wrote:
>On 07/29/2015 07:11 AM, moltonel 3x Combo wrote:
>> Routers can already use 'prefer primary to secondary' worldwide.
>> Nowhere in the OSM world is secondary defined as better than primary.
>> In any given area. a car router can confidently prefer 'primary'.
>Based on what John Willis has said about tagging in Japan, I don't
>this is true.
> From what I understand from his previous posts to this and other OSM 
>mailing lists, the OSM tagging in Japan follows the official 
>classification, and often results in small windy roads through cities 
>that are historically important being marked as primary, while modern 
>bypass roads are marked as secondary or even lower.
>I think that this breaks a router's idea that primary is "better" than 
>secondary, and I think that this problem is exactly why people advocate
>for not following official classification.
>Tagging mailing list
>Tagging at openstreetmap.org
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