On Wed, Oct 14, 2009 at 10:57 AM, David ``Smith'' <[email protected]>wrote:
> On Wed, Oct 14, 2009 at 4:06 AM, Trevor Hook > <[email protected]> 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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