[OSM-talk] tagging maxspeed restricted to time span

[Tapio Sokura]

D Tucny wrote:
> Unless it's changed recently, the 'Map Features' restrictions tags are not
> sufficient to tag restrictions in enough detail to accurately reflect many
> real world restrictions... It's something that will be complex to get 
> right,
> and it's unlikely to be a simple solution... So, we should probably 
> start by
> detailing some real world restrictions that we will need to document so 
> that
> we can discuss and devise a solution...

I've been following the discussion on turning restrictions etc for a 
while now. Every now and then someone mentions GDF, the data model most 
commercial road data producers and consumers use. If most of the data 
model problems have already been solved by GDF, what's stopping us from 
using (parts or all of) it? Sure it's an ISO standard and they cost 
money, but the specifications seem to be freely available as well (for 
example pdfs at 
http://www.ertico.com/en/links/links/gdf_-_geographic_data_files.htm).

In any case I'd rather we develop a very good model or use an existing 
model. I'm afraid anything made out of bubble gum by using the current 
node/segment/way/area key-value pairs will just lead into further 
trouble and extra work later on.

   Tapio

PS. I haven't actually read the GDF spec so I don't know how braindead 
or not it is, but at least it is something that probably should be 
looked at.