[OSM-newbies] Highway Types and Speed Limits

David ``Smith'' vidthekid at gmail.com
Wed Oct 14 10:57:26 BST 2009

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.

David "Smith"
a.k.a. Vid the Kid
a.k.a. Bír'd'in

Does this font make me look fat?

More information about the newbies mailing list