At 2011-01-04 11:08, =?UTF-8?Q?M=E2=88=A1rtin_Koppenhoefer?= wrote:
2010/12/30 Steve Bennett <[email protected]>:
> On Thu, Dec 30, 2010 at 9:00 AM, Nic Roets <[email protected]> wrote:
>> I know it may look like a lot of work adding all the no_left_turns,
but it's
>> the right way.
>
> I have to disagree. OSM happens to have started in the UK, but that
> doesn't mean that UK defaults make sense everywhere.
I agree with Nic. AFAIK there are no defaults in OSM, not UK ones, and
not others. Any not given Information is simply not yet entered.
There are defaults that are documented. Off the top of my head:
highway=*_link implies oneway=yes
junction=roundabout implies oneway=yes
no layer tag implies layer=0
no turn restriction at an intersection implies traffic can flow between the
ways
Undocumented:
power=line implies layer=1 more than whatever it crosses (i.e. no crossing
way error)
> I think we definitely need to define defaults that make sense for each
> country, and formalise this in some way. Preferably in the database,
> perhaps as tags on the country boundary: "default:no_left_turn=yes" or
> something.
Yes. Not just country, but at least one more level down.
--
Alan Mintz <[email protected]>
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