Am Montag, 8. September 2014 schrieb Tod Fitch :
How does this sound?
+1
Cheers,
Martin
--
Martin Koppenhoefer (Dipl-Ing. Arch.)
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On 09/08/2014 05:27 PM, Tod Fitch wrote:
[...]
instead there is a state wide prima facie limit:
source:maxspeed=US:CA:residential
[...]
My state doesn't have such a limit, but my city does. Supposing I
started tagging things with source:maxspeed=US:VT:Burlington, would
anyone be upset that
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
retagged.
On Sep 9, 2014, at 6:10 AM, Andrew Guertin wrote:
On 09/08/2014 05:27 PM, Tod Fitch wrote:
[...]
instead there is a state wide prima facie limit:
source:maxspeed=US:CA:residential
[...]
My state doesn't have such a limit, but my city does. Supposing I started
tagging things with
I'm of the opinion that wherever the speed limit is just the default for
that road class, it should not need to be posted at all. Any data user can
then infer limits.
Martijn
On Mon, Sep 8, 2014 at 3:27 PM, Tod Fitch t...@fitchdesign.com wrote:
Thus far I've only applied the maxspeed tag to
One street here in Nashville, TN, went for several years without any speed
limit signs along its three-mile length. Then, one day, it suddenly had signs
every half-mile or so. I suspect that someone probably argued their way out of
a speeding ticket on the grounds that there weren't any posted
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.
The federal government doesn't have anything to say about speed
limits (in states), as the US Constitution leaves
On Sep 9, 2014, at 10:31 AM, stevea wrote:
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.
The federal government doesn't have anything to say about speed
There's a functional difference between speed limits and the actual speed
driven. For ETA prediction, speed limit data is not all that useful -
detailed historical and live speed profiles are. That is not data that is
in OSM (or should be). The speed limits are mostly useful for alerting
drivers
Historical and live speed profiles are pretty much required for trip planning
in congested urban areas, but for those of us who drive close to the speed
limit and make long trips on relatively uncrowded rural freeways, travel time
estimates based on posted (or prima facie) speeds are a good
Agreed - that's a pretty small use case, relatively, though.
On Tue, Sep 9, 2014 at 1:38 PM, Tod Fitch t...@fitchdesign.com wrote:
Historical and live speed profiles are pretty much required for trip
planning in congested urban areas, but for those of us who drive close to
the speed limit and
Yes, a pretty small use case at somewhere around 10,000,000 trips per year on
I-5 through the central valley of California. Or 9,000,000 trips per year each
way on I-8 across the desert to the Arizona border.
On your daily commute, you may not need help navigating so much as you want
accurate
Thanks for clarifying, Tod. For ETA the congested urban use case is much
more challenging to get right, and much more likely to rely on an dynamic
ETA estimate. If you're on a multi-hour trip, you're more likely to have
scoped out your travel time before you leave and planned accordingly, and
if
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