[OSM-talk] Highways tagging vs Polygon

[Lester Caine]

Mario Salvini wrote:
> Richard Bullock schrieb:
>> Am I missing something, or can we not just assume that e.g.
>>
>> each highway=residential has a speed limit consistent with urban areas in 
>> that country - unless explicitly tagged otherwise
>>
>> e.g. in the UK, highway=residential would be 30mph (48.28032km/h), unless 
>> tagged as something else.
>>
>> each highway=trunk, primary, secondary etc. has a default speed limit 
>> consistent with rural areas in that country - unless tagged otherwise.
>>
>> each highway=motorway has a default motorway speed consistent for that 
>> country.
>>
>> That way, we only need to tag major through routes in cities, and rural 
>> roads which do not have the usual national speed limit.
>>
>> The same thing applies for access restrictions. We don't need to tag that 
>> roads are accessible for cars - that should be assumed unless tagged 
>> otherwise
>>   
> highway=residental _isnot_ the same as "build-up-area in the meaning of 
> traffic laws".
> E.g. commercial- or industry-areas which are "in town" by traffic 
> law/signs don't have "residential roads".
> 
> And thats just one example.

BUT highway=xxx does define the type of road, and if residential is 
maxspeed=30 and safe_residential is maxspeed=20 by default that makes 
perfect sense. service roads may well have a lower speed limit, even 
within an 'in_town' area. It's not unusual to have a 15 mph limit on 
these roads because of activity such as unloading taking place on them.

I think the polygon idea HAS been kicked into touch now, but there IS 
possibly a need for additional tag to cover the other traffic regulation 
information so far put forward, and using that to REPLACE highway tags ( 
as currently suggested on the wiki page ) is a no no! SPEED information 
should be handled using the existing maxspeed + defaults relating to the 
road type, which MAY have a country related element to them as again 
listed on the relevent wiki page ( Links were posted earlier )

-- 
Lester Caine - G8HFL
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