Re: [Talk-GB] NSL in built-up areas: what source:maxspeed to use?

[Jason Cunningham]

On 25 May 2012 12:30, Andrew Chadwick  wrote:

> What value should we use for source:maxspeed=* in built-up areas when
> there's no signage or road markings, just street 
> lights?
>

There was bit of discussion on this about a year ago.
While some guidance may strongly indicate (mislead?) that lightng+urban
area = 30mph this is not the case. These roads are 'National Speed Limit -
Restricted Roads', where the presence of street lighting enforces and
reminds that the road is a Restricted Road. As Restricted Roads do not
necessarily occur in 'build up areas' I think using built-up_area would be
misleading. The word 'restricted' may not be commonly used, but it has the
effect of making people think about what they're adding.

More importantly taginfo shows source:maxspeed=UK:restricted_road is
clearly the common way of tagging uk restricted roads.
http://taginfo.openstreetmap.org/search?q=source%3Amaxspeed%3Duk

I didn't respond the original emails a year ago, but as a result I did
start adding speed limits. Quickly realised how utterly confusing UK/GB
speed limits are and wrote down a bundle of notes mainly aimed at trying to
work out speed limits on badly signed roundabouts along NSL roads. Lost
original notes but a lot was remembered and I've added them to a personal
'uk speed limit notes page'. I think it sums up GB/UK speed limits, and
I've cleaned it up a lot today.
http://wiki.openstreetmap.org/wiki/User:Jamicu/UK_Speed_Limits

Second issue is the change in the wiki to suggest GB instead of UK. The
intended result is the same and I have a preference for GB because it's
'official', but once again taginfo shows that UK is the common way of
indicating the speed limit is British version.
http://taginfo.openstreetmap.org/search?q=source%3Amaxspeed%3Duk
http://taginfo.openstreetmap.org/search?q=source%3Amaxspeed%3Dgb
I can't support changing to GB unless it involves changing all the UK
maxspeeds to GB maxspeeds. Having two versions is confusing and unless this
can happen I'd rather stick with UK.

Cheers,

Jason
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Re: [Talk-GB] NSL in built-up areas: what source:maxspeed to use?

[Borbus]

On 25/05/12 12:30, Andrew Chadwick wrote:
> What value should we use for source:maxspeed=* in built-up areas when
> there's no signage or road markings, just street lights?

There *should* always be signage indicating a change in maxspeed from
something else to 30 mph.

The street lights merely act as repeaters, since normally repeaters are
required every so many yards for a non-NSL limit.  The presence of
street lights does *not* mean 30 mph (just need to look at any lit
motorway for evidence of this).

I have found anomalies, though.  In fact, I happen to live on a road
which is not signed correctly.  It joins a 40 mph road, but there is no
indication of change of speed limit.  I have informed my local council
about this but never heard anything back.

I think really the only thing we can do in such situations is use common
sense.  So source:maxspeed=common_sense?

Alternatively, you could ask the local council which should know the
real limits.

-- 
Borbus.

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