[OSM-talk] Highway = Motorway automatically oneway ?

[Ulf Lamping]

Andy Allan schrieb:
> On 10/14/07, Ulf Lamping <ulf.lamping at web.de> wrote:
>   
>> You are making a lot of assumptions with saying that motorway is
>> automatically oneway.
>>     
> No, we're making one assumption. If a tag can be assumed for 95% of
> the time, then it saves 95% of tedious repetitive tagging. That's why
> I assume ncn=yes if there's a ncn_ref tag, for instance - it's less
> laborious for everyone, leaving more time in the world for more
> enjoyable things!
>   
ACK.
>> I know some parts in the alps (italy or switzerland) where motorways
>> don't have strictly seperated lanes for both directions, so the oneway
>> tag is not the right choice here AFAI understand this tag.
>>     
> So tag them as oneway = no. It's easier to do this than assume
> oneway=no on everything and tag the other 99% as oneway = yes.
>   
FULLY ACK.

I didn't even thought about oneway=no to be honest ;-)

BTW: Could someone please, please add the results of this discussion to 
the motorway wiki page(s), so we don't have to repeat it in the ml again ...
>> P.S: motorway_links (at least here in germany) are *very often* not
>> oneway, already noted!
>>     
> Really? Are you allowed to drive along the motorway link and turn
> round and drive back down it (i.e. do a U-turn)? Sections of road
> where U-turns are disallowed (whether by physical divider or lines on
> the road or somesuch) can be modelled by opposing oneway=yes highways.
>   
AFAIR, I read somewhere that you shouldn't do that ;-)

I've usually mapped/tagged such a motorway_link (the one from the photo 
is a typical german "Anschlußstelle") as two (or more) small oneway=yes 
(where it links to a primary), then a larger "normal" part and then 
another two smaller oneway=yes where it actually links to the motorway.

I don't know if this is the "right way" to do this, but I've seen it 
similar in other parts of germany ...

Regards, ULFL