[Tagging] Tagging 'advance' turn restrictions

[Colin Smale]

On 2017-04-06 14:33, Tom Pfeifer wrote:

> On 05.04.2017 23:42, Kevin Kenny wrote: 
> 
>> On Wed, Apr 5, 2017 at 5:19 PM, Warin <61sundowner at gmail.com <mailto:61sundowner at gmail.com>> wrote:
>> 
>> Where the solid lines start have a separate way for each lane
>> 
>> this way routing engines will regard them as separate roads and stop trying to get you from one
>> lane to another.
>> 
>> But then, won't routing engines announce that I have to turn left or right in order to take the left
>> or right lane? "Turn left onto Nott Terrace" when I'm already on Nott Terrace would be a pretty
>> confusing instruction. What am I missing?

Navigation systems take account of the angles when deciding what
instructions to give. If a way splits with both 
forks being nearly straight-on and with a small angle between them they
will be saying "keep left/right" and not "turn left/right". 

Routing is distinct from navigation. Routing is mathematically choosing
which lines to follow. Navigation is much more than that - it 
is for the human, so it's about searching for locations, giving
directions (based on the result of the "routing"), displaying maps etc. 

//colin
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