[OSM-talk] Lane turn restrictions

[Martin Norbäck]

If we just add lane information to
http://wiki.openstreetmap.org/wiki/Relation:destination_sign can we
make it work?

/Martin

> Date: Wed, 19 Aug 2009 09:55:01 +0100 (BST)
> From: Steve Hill <steve at nexusuk.org>
> Subject: Re: [OSM-talk] Lane turn restrictions
> To: Yann Coupin <yann at coupin.net>
> Cc: talk at openstreetmap.org
> Message-ID:
>        <alpine.LRH.2.00.0908190939450.1980 at persephone.nexusuk.org>
> Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed
>
> On Wed, 19 Aug 2009, Yann Coupin wrote:
>
>> I once started a proposition to do just that but it didn't get much traction,
>> feel free to discuss it.
>>
>> http://wiki.openstreetmap.org/wiki/Proposed_features/Relation:type%3Droute_instruction
>
> I've not read the discussion page yet, but some initial thoughts:
>
> Your first examples aren't topologically identical - the first is a 2 lane
> road with a short 3 lane section followed by a right hand turn whilst the
> second is a 3 lane road with a right hand turn immediately followed by
> dropping down to 2 lanes.  Of course, this doesn't give you enough detail
> to know what lane you've got to be in (although you could make some
> educated guesses).
>
> I also don't see the need for phonetics to be tagged (in fact, it seems
> harmful because it breaks multi-language support).  We don't know what
> kind of display device is going to be used (whether it be on-screen
> instructions, text to speech, etc.) and it should be up to the software to
> decide how to present it to the user rather than being explicitly tagged
> like that.
>
> Overall, the proposal seems a bit too complex - I had envisaged a
> simpler system whereby you could set a relation similar to a turn
> restriction, such as:
>        TAGs:
>                type: lane_restriction
>                lanes: 1,2
>        Members:
>                from: <way the user is driving along>
>                to: <way the user wants to turn onto>
>                via: <junction node>
> Whereby that marks a restriction that lanes 1 and 2 (the left two lanes,
> in the case of the UK) cannot be used in a route using the <from>, <to>
> and <via> members.
>
> It would actually be nicer to be able to tag which lanes are allowed
> rather than which are disallowed, but that would be inconsistent with the
> existing turn restrictions (maybe that isn't a problem?  comments?)