On 09/04/11 08:20, Peter Miller wrote:
On 9 April 2011 08:15, Peter Miller <peter.mil...@itoworld.com
<mailto:peter.mil...@itoworld.com>> wrote:
On 6 April 2011 16:53, Ed Loach <e...@loach.me.uk
<mailto:e...@loach.me.uk>> wrote:
Richard wrote:
> I'd put the number for cars (ie 70mph for a dual
carriageway), and
> the source if it's not the number that's on the sign.
This is similar to what I've done. For areas where a national
speed
limit applies I have used
maxspeed= (maximum speed for cars, which is the maximum
maximum I believe, if you see what I mean)
I was also tagging
maxspeed:type=national
or
maxspeed:type=national_dual_carriageway
(no others apply locally). I added these mainly for my use in case
the government ever change the maximum speed for cars on such
roads,
as has been rumoured on occasion in the press, so that I can use
XAPI or JOSM or similar to update the maxspeed values more
easily).
We seem to be nudging towards something close to a conclusion.
Can I suggest that the following two methods are valid, however
the second one should be considered to be 'better' and where it is
used then it should be retained to avoid edit warring.
I have worked a bit on the 'type' tagging to allow it to include
the county which might be GB or UK depending on how Northern
Ireland interprets the rules - is it always the same as the rest
of the UK?
On reflection the convention used elsewhere to put the IT:urban or
whatever into the source:maxspeed tag seems to be misunderstanding
the purpose of source tag which should be for such explanations as
'survey' or 'TfL open speed data' or whatever. Notice that I am
have used 'GB:urban' for the 30mph no sign situation to match up
better with 'IT:urban' etc.
I have added some more examples for each method for clarity
Method 1
maxspeed=national
source:maxspeed=survey
maxspeed=xx mph
source:maxspeed=survey
Method 2
maxspeed=60 mph
maxspeed:type=GB:dual_carriageway (or GB:motorway, GB:rural, GB:urban)
source:maxspeed=survey
maxspeed=70 mph
maxspeed:type=GB:motorway
source:maxspeed=survey
maxspeed=60 mph
maxspeed:type=GB:rural
source:maxspeed=survey
maxspeed=60 mph
maxspeed:type=numeric sign
source:maxspeed=survey
maxspeed=30 mph
maxspeed:type=GB:urban
source:maxspeed=survey
maxspeed=30 mph
maxspeed:type=numeric sign
source:maxspeed=survey
I *hate* the idea that signed speed limits that currently just need
maxspeed=x would now need two extra tags. That is exactly what I meant
by think of the mapper. Why should I add extra tags?
I have surveyed an area, added the road type, name, and a source tag,
now to add a speed limit I need to double the number tags?!? This is ill
conceived.
My suggestion:
maxspeed= x mph where it is signed.
maxspeed=national where NSL applies, with
national=single / dual to distinguish between single and dual
carriageway limits. Motorways fall out automatically from the highway tag.
Please think of the mapper, and keep it simple. This will also be
consistent with existing tagging / renderers etc and stands a chance of
being used.
--
Cheers, Chris
user: chillly
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