[Talk-us] Prima Facie Speed Limits

Marc Gemis marc.gemis at gmail.com
Tue Sep 9 05:30:26 UTC 2014

In Europe (at least Germany, Belgium, The Netherlands, UK) people started
to add both source:maxspeed=<country code>:<classification> and explicit
maxspeed tags. Then there is no need for an external DB to lookup the
speeds. Although it means that when the speed changes, all roads have to be


On Tue, Sep 9, 2014 at 1:00 AM, Tod Fitch <tod at fitchdesign.com> wrote:

> California has a 25 MPH rule for school zones while Arizona has (or at
> least had when I lived there) a 15 MPH school zone limit. It seems that 25
> MPH in a residential area is pretty standard but I think states have enough
> discretion in setting limits that they could vary from one state to the
> next. So I think the source attribution should allow for differences
> between states for the same class of road. Thus my suggestion for
> "source:maxspeed=US:CA:residential" for tagging in my area.
> On Sep 8, 2014, at 2:55 PM, Greg Morgan wrote:
> On Mon, Sep 8, 2014 at 2:27 PM, Tod Fitch <tod at fitchdesign.com> wrote:
>> Thus far I've only applied the maxspeed tag to roads with a posted speed
>> limit. But here in California most residential roads are not posted,
>> instead there is a state wide prima facie limit:
>> http://www.dmv.ca.gov/pubs/vctop/d11/vc22352.htm
> I wonder if 15 mph in a school zone and 25 mph in a residential area are
> some sort of federal standard?  The source tag might be useful but not much
> different than other states.
> Regards,
> Greg
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