OK so it is a kind of buffer to keep the motorised traffic out of the
way of the bikes. Are there any circumstances under which any kind of
vehicle is permitted to be in that lane (while it is not a turn lane)? 

That sounds too complex for highway=primary (or whatever) and
cycleway=lane. Leveraging the lanes tagging system, we could have
something like yield motor_vehicle:lanes=yes|yes|no|no and
bicycle:lanes=no|no|no|yes. 

On 2015-02-03 12:45, Martin Vonwald wrote: 

> Yesterday I had the following case on a dual carriageway - lanes from left to 
> right: * two regular lanes * one shoulder * one bicycle lane
> 
> Sometimes the shoulder changes to a turning lane and back to a shoulder after 
> a junction. There is no physical separation whatsoever of all those four 
> lanes. Additional bicycle lanes may also be present.
> 
> Regards, Martin
> 
> 2015-02-03 12:33 GMT+01:00 Paul Johnson <ba...@ursamundi.org>:
> 
> Unless I'm way off, maybe a gore point? Transition into a traditional toll 
> plaza? 
> 
> On Feb 3, 2015 5:30 AM, "Colin Smale" <colin.sm...@xs4all.nl> wrote:
> 
> A shoulder lane in the middle of the carriageway? Maybe you can illustrate 
> your scenario. 
> 
> Under normal circumstances (one way per carriageway) shoulder=left/right/both 
> should cover it. 
> 
> Or am I misunderstanding what you mean by "shoulder"? 
> 
> On 2015-02-03 12:23, Martin Vonwald wrote: 
> 
> 2015-02-03 12:18 GMT+01:00 Colin Smale <colin.sm...@xs4all.nl>:
> 
> That's an easy one: shoulder=yes. 
> Can you please explain to me, how this answers the question WHERE the 
> shoulder is? It does NOT have to be the leftmost or rightmost lane. 
> 
> _______________________________________________
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