[OSM-newbies] Highway Types and Speed Limits

[Trevor Hook]

On Wed, Oct 14, 2009 at 10:57 AM, David ``Smith'' <vidthekid at gmail.com>wrote:

> On Wed, Oct 14, 2009 at 4:06 AM, Trevor Hook
> <trevor.k.hook at googlemail.com> wrote:
> > When I'm tagging say, a residential street, should I also be tagging the
> > 30mph speed limit that the residential street implies (at least in the
> UK)
> > or should I only tag if the street has a non-standard speed limit such as
> 20
> > or 40mph?
>
> Route planning applications aren't likely to know very well what a
> "standard" or "default" speed limit is for a given type of road in a
> given country.  Furthermore, there are many criteria to consider when
> deciding what highway=* tag to give a road on OSM, and those criteria
> aren't likely to match up with how local authorities classify a road
> for the purposes of assigning a speed limit.  Therefore, if you know
> the speed limit of a road, by all means tag it!
>
> PS If you're going to tag speed limits in miles per hour, always make
> sure it's formatted properly, with a space between the number and the
> unit, and the unit (mph) in lowercase.
>

Thanks David,

Thats what I thought would be the case, I have used the maxspeed tag before
in other situations where a road doesn't have a default speed limit so I'm
aware of the "NN mph" gotcha.

Looks like I have a lot of roads in my area to update, it will give me
something to do :)

Trevor
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