[Tagging] How to tag: Legally separated ways
colin.smale at xs4all.nl
Tue Oct 16 09:55:12 GMT 2012
Are you seriously suggesting that emergency services will trust a satnav
in preference to their own eyes and brains? Especially a satnav driven
by data with no proactive quality control and no-one you can
sue/complain to? And seriously incomplete data? I think you are looking
at a multi-year project to get all this information into OSM (read:
"review and correct the tagging and topology of every road in the
database") while all the time thousands of people are adding new "bad"
data? A popular dutch saying "mopping up with the tap still running"
comes to mind.
Let's not have a purely hypothetical debate, let's keep it practical.
Assuming that emergency services currently use satnavs (consumer or
special-purpose) based on commercial data, what would they say if we
asked them "what would you need from OSM data to make it a better choice
than your current supplier?" I can imagine that the time delay between
changes on the ground and their availability in a map update might be
one concern; inappropriate road classifications might be another. I
would like to hear it from them, though. Then we can look at the
requirements and assess whether it is a viable project.
On 16/10/2012 10:37, Simone Saviolo wrote:
> 2012/10/15 Colin Smale <colin.smale at xs4all.nl
> <mailto:colin.smale at xs4all.nl>>
> I don't understand why emergency vehicles are so important in this
> Because OSM publicly advertises the fact that its maps are being used
> in the Gaza's strip by emergency vehicles that would otherwise have no
> map? Just to name one. Also because emergency vehicles may happen to
> operate in unknown territory. Don't limit yourself to the ambulance
> that runs around its home town.
> In the first place they have wide-ranging exemptions from traffic
> rules, which (let's be honest) we are never going to tag in OSM.
> This is meaningless. We will map all restrictions; consumers will have
> an "emergency vehicle" flag that will route ignoring those
> restrictions. Also, while an ambulance is allowed to go the wrong way
> in a one-way street (when its siren is on, of course), it is usually
> advised against doing so, as in a narrow road it may find regular
> traffic, which would be dangerous or at least slow down the ambulance.
> So, restrictions may be ignored, but drivers should be informed about
> Secondly they are never going to be relying on OSM data (or indeed
> any normal sat-nav) for lane-precise routing. They are trained to
> use their eyes and brains to make split-second decisions on what
> is safe and an acceptable risk under the circumstances of that
> Sure. Let's make an example. There's a long primary road between
> towns, with solid double lines all the way from town A to town B.
> Let's say it runs North-South from town A to town B. A farmyard east
> of the road is burning. It can be accessed by a road that reaches the
> large road; under normal circumstances, someone coming from town A
> couldn't reach the crossroad and go to the farmyard, but would be
> legally forced to go to town B, turn back, reach the crossroad and go
> the farm.
> The firemen turn on their GPS navigator, because they're being called
> in from a far away city and they've never heard the name of that
> farmyard. The router lawfully sends them to town A, then to town B.
> They go past the crossroad and can't notice the farmyard, because it's
> far away and there's a wood in between that covers it. Also they can't
> see on the screen that ten kilometres ahead they would have to turn
> back and go back to the crossroad they're approaching. The firemen get
> there fifteen minutes late and the farmyard is a bunch of ashes. Great
> work dividing the way on a legal restriction! :-)
> Thirdly, they will be about 0.0000000001% of the potential users
> of OSM data - why should we compromise "service" to the vast
> majority of real users for the hypothetical benefit of the very few.
> I know who makes this consideration: commercial map providers. It's
> just not worth the cost, right?
> Tagging mailing list
> Tagging at openstreetmap.org
-------------- next part --------------
An HTML attachment was scrubbed...
More information about the Tagging