[OSM-talk] Turn left restriction on two way highways

[M∡rtin Koppenhoefer]

2010/12/30 Steve Bennett <stevagewp at gmail.com>:
> On Thu, Dec 30, 2010 at 9:00 AM, Nic Roets <nroets at gmail.com> 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.


> 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.


this makes evaluation immensely complicated. As of now, it would
simply break routing as long as this is not implemented.


>> 3. Tourists who map in Argentina may not do the right thing.
>
> It's far more important that people who live in the country have tags
> that are easy to use and make sense for them. Just witness the endless
> confusion and debates that (UK-specific) tags like
> "highway=unclassified" and "highway=cycleway" have caused for the rest
> of the world.


have they? I doubt that the problem came from UK-specificy, mostly it
came from users ignoring the wiki or asuming "defaults" that weren't
actually documented or missleading or underspecified wiki definitions.


> I'm actually starting to think it would make more sense for each local
> community to map using their own tag schema, and then to define
> cross-walks to allow the communities to join up.


I'd say this is another project, not OSM.


cheers,
Martin