[talk-au] maxspeed - best practice?

Ben Johnson tangararama at gmail.com
Tue Aug 14 17:26:32 BST 2012


Hi John,

I really like this, but I think your "source:maxspeed=AU:urban" below is a typo. It would be simply 

maxspeed=AU:urban

Does anyone else have thoughts on this? Could this be our default (site-unseen) for residential streets - or is this an across-the-board solution and we combine it with a source:maxspeed tag of some form to determine whether site-unseen or surveyed.

John - as for the Wiki, I agree with you, a lot of Aussie stuff needs to be in the Wiki, and following global standards if they exist. A lot of useful stuff gets discussed in here, but I believe the bulk of contributors do not subscribe to talk-au. They probably don't know or care about list. They use JOSM / Potlatch presets as an editing guide - failing that, they fall back on the Wiki and the Help Centre for clarification.

I see a useful role for talk-au to be a melting pot for ideas and local policies that should be disseminated via the Australian sections of the Wiki.... but, who has the time and motivation to take on this task is another matter!!!

BJ


Sent from my iPad

On 14/08/2012, at 16:52, John Berkers <berjo at ozemail.com.au> wrote:

> I was looking into this some time ago as well.  The standard in other parts of the world, according to the wiki, for default speed limits is to tag like:
> 
> source:maxspeed=AU:urban
> 
> If there is a sign designating the speed limit, the wiki indicates it should always be tagged
> 
> source:maxspeed=sign
> 
> If there are markings on the road:
> 
> source:maxspeed=markings
> 
> I know that, in Victoria at least, all areas other than urban/residential are either sign-posted or have road markings.
> 
> My view is that, where possible, we should use a similar standard to what is use around the world for this.  I don't think it is particularly helpful to use a long, descriptive string like "default residential speed limit in Australia" since it is intended for use primarily by a routing application a map renderer.
> 
> Perhaps it is time to add Australia to the list of countries on:
> 
> http://wiki.openstreetmap.org/wiki/OSM_tags_for_routing/Maxspeed
> 
> Does anyone else have a point of view on this with respect to Australia?
> 
> Regards,
> 
> John Berkers
> 
> On Tue, Aug 14, 2012 at 3:30 PM, Ben Johnson <tangararama at gmail.com> wrote:
> In regards to residential areas - I remember last year there was some talk about the bot that added "50" with the (incorrect) "maxspeed:source" key = "default residential speed limit in Australia"  and I think there was consensus in the local community that this was a mistake.
> 
> With remapping some of my local areas, I'm now curious what's best practice in Australia is for tagging maxspeed on residential streets. Specifically...
> 
> a) is it even necessary or desirable to explicitly define maxspeed for every residential way - or should we just presume any highway=residential is maxspeed=50, unless otherwise stated?
> 
> b) if presumptions do exist, should 50 zones on tertiary and unclassified ways be explictly tagged ?
> 
> c) if tagging maxspeed on every street, in respect to source... does a simple source:maxspeed=sign suffice for the "general area" or only for the specific way on which the sign is placed?  I notice these residential 50 speed signs are often on tertiary streets, or gateway points into general residential areas.  Side-streets obviously share the 50 limit, but are mostly not signposted. Do we need a new standard source value like source:maxspeed=implied for the side streets ?
> 
> Sorry if I'm re-covering old ground - I'm just not sure where it was left... if anywhere!
> 
> Thanks in advance.. BJ
> 
> 
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