I don't understand why emergency vehicles are so important in this
discussion. 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.
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 moment. 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.
Colin
On 15/10/2012 19:55, Alberto wrote:
a) One way with lanes=4
b) Two separate ways with lanes=2 each
c) Tell me!
a) because distinction between physical and legal barriers is important.
Ok in that picture there is no much difference, but as Simone pointed out,
for long roads there is a big difference: if any router can't distinguish
between physical and legal barrier, it will not suggest to emergency vehicle
to cross the line, and it will tell them to do a long alternative trip
instead. This is a big problem, because when you are driving the GPS shows
you only a little portion of the route and you may not understand
(especially in emergency) that you can shorten the route simply crossing the
line.
Moreover if we accept solution b) we should tag every road with continuous
line in the middle as two separate roads, one for each direction.
Additionally to the lanes=4 and oneway=yes you could put a divider-tag on
the way http://wiki.openstreetmap.org/wiki/Proposed_features/Divider
even if it doesn't explicitly tell you where the divider is placed you
might be able to infer it from the following ways (at least in this case).
+1 We can improve this proposal, to make clear where the divider is placed.
Cheers
Alberto (Viking81)
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