[Tagging] maxspeed:type vs source:maxspeed // StreetComplete

Tobias Zwick osm at westnordost.de
Wed Sep 19 19:26:43 UTC 2018


Okay, so US-American legislation usually differs between "residential
district" and "business district" for maxspeed defaults, as opposed to
"built-up area" in most other countries.

Actually, there is a tag to denote that a street is in a residential
district or business district. It comes from the early days of OSM where
people were mapping with their GPS trackers for the lack of available
aerial imagery. What about this?:

abutters=residential
abutters=commercial

See https://wiki.openstreetmap.org/wiki/Key:abutters

On 19/09/2018 14:08, Greg Troxel wrote:
> Tod Fitch <tod at fitchdesign.com> writes:
> 
>>> On Sep 18, 2018, at 6:19 PM, Joseph Eisenberg <joseph.eisenberg at gmail.com> wrote:
>>>
>>> So on the boundary=administrative admin_level=6 for Rogers County, we could have something like maxspeed:type:default=45mph
>>
>> Except that more typically there will be different default speed
>> limits on each of the various OSM highway classifications. So maybe
>> something more like “maxspeed:default:residential=25 mph”.
> 
> I am not aware of *unposted* default limits in the US being different by
> an entity smaller than state.   In Massachusetts, there are default
> limits in state statutes, in particularly 30 mph in "thickly settled"
> areas (also defined in statute).  Some towns have adopted 25 mph in
> thickly settled areas, and they have signs at the town borders.
> 
> It's an interesting question at what level to tag individual roads and
> when to have some way of expressing rules and therefore to expect all
> data consumers to evaluate the rules.  My quick reaction is that
> publishing rules for regions smaller than states is going to be too
> messy, vs just tagging the ways.
> 
> With respect to maxspeed:default:residential, that's totally unworkable
> in Massachusetts.  The law does not talk about roads or even define them
> as residential or not.   The question for 30 (vs 40) is whether the road
> is "thickly settled", which is
> 
>   built up with structures devoted to business, or the territory
>   contiguous to any way where the dwelling houses are situated at such
>   distances as will average less than two hundred feet between them for
>   a distance of a quarter of a mile or over.
> 
> So there are many roads that are properly tagged "residential" but are
> not subject to the lower speed.
> 
> In Mass, we have speed limit tags on almost all legal roads.  To me,
> that seems like the most straightforward approach, even if there are
> also defaults.
> 
> If the general defaults are intended for routing, that seems more or
> less ok.  If they are intended to actually provide speed limit guidance
> to drivers, I'm opposed, at least in jurisdictions where they aren't
> strictly reliable.
> 
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