[OSM-talk] prohibited/restricted/priority and mandatory manoeuvres

[David Earl]

It's only a tag name: I really don't think the name matters, but if it 
increases the sum of happiness, feel free.

May I suggest you add this to the discussion on that page of the wiki, 
so we capture the discussion.

Dave


On 20/10/2007 16:10, Peter Miller wrote:
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> 
> So we now have relationships to play with, which is just great. Now we 
> need to decide how to use them before we encode lots of data, and before 
> people start coding journey planners.
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> Currently we have a proposal of ‘turn_restriction’.
> 
> http://wiki.openstreetmap.org/index.php/Relationships
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> IMHO, I don’t think the word ‘turn’ is correct, because we might be 
> talking about something that is straight-on, so the phase ‘manoeuvre’ is 
> actually the more appropriate Engish term (or actually probably the 
> better French term that has now been appropriated by the English from 
> the spelling). Also, the term restricted is not quite right. See below 
> for how the other standards use the phrase.
> 
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> If one looks at other standards, such as GDF 
> (http://www.ertico.com/en/links/links/gdf_-_geographic_data_files.htm) 
> or the equivalent from the Ordnance Survey 
> (http://www.ordnancesurvey.co.uk/oswebsite/products/osmastermap/userguides/docs/OSMM_ITN_userguide_v1.0.pdf) 
> one finds that they tease out other important different sorts of 
> manoeuvre. There is also consistent terminology between these standards 
> (and GDF is now an ISO standard).
> 
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> In these documents they identify the following routing limitations.
> 
>  
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> 1) Prohibited_manoeuvre ; one that there is a not legal, but might be 
> physically possible (GDF and ITN).
> 
> 2) Restricted_manoeuvre ; that that it is not impossible to make (often 
> for identified classes of vehicle) (GDF and ITN)
> 
> 3) Priority_manoeuvre ; one that does not need to be announced as you 
> are following the same road. (GDF and ITN)
> 
> 4) mandatory_manoeuvre ; one that you must make. (ITN only)
> 
> 5) Finally, there is also a special type of prohibited manoeuvre with 
> ‘no U turn’ for dual carriageways. The actual encoding of the 
> prohibition includes three ways, the one on the initial dual 
> carriageway, the short stub across the carriageway and then the link on 
> the other carriageway coming back again. For this we would need to have 
> three associated ways ‘from’ ‘via’ and ‘to’. (ITN only)
> 
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> For all of these above types, they can be restricted by time and by 
> vehicle class.
> 
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> I propose that we use the above phases as appropriate in place of 
> ‘turn_restriction’ and keep the ‘roles’ as described in the proposal.
> 
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> If anyone is interested, there is a comparison between GDF and OSM here:
> 
> http://wiki.openstreetmap.org/index.php/GDF
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> Regards,
> 
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> PeterIto
> 
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