[Tagging] mandatory restriction with via way as members

[Michael Tsang]

On Tuesday 02 May 2017 11:25:10 Tobias Wrede wrote:

> I would understand it the same way. To be a little bit more concrete: If
> you come from the northbound Gloucester Rd via the nothern loop (way
> 46615969) onto Victoria Park Rd (way 46615970 and onward) you must
> continue on the northern bit of westbound Gloucester Rd (way 244383612)
> and you are not allowed to take the middle or southern Gloucester Rd
> (244383597 and 486608995). If you come from the secondary Gloucester Rd
> (way 486608999), the other bit of Victoria Park Rd (way 87081210),
> Cannon St or Percival St, though, you may continue on either the
> northern, middle or southern part of Gloucester Rd.
> 
> This arrangement looks a bit strange to me. Is this what you intended to
> tag? 

Yes, exactly.

> If there is such rule set in place on is there not any physical
> barrier on the road preventing the lane changes? 

The rule is on but there are only solid lines and police cars nearby without 
any physical barrier.

> That case might warrant
> splitting the raod into two parallel segments.

It was originally tagged so, but according to the discussions earlier titled 
"Tagging 'advance' turn restrictions", 

On Thursday 06 April 2017 00:29:49 Tom Pfeifer wrote:
> On 05.04.2017 23:19, Warin wrote:
> > Where the solid lines start have a separate way for each lane
> 
> Do _not_. Separate ways are used when the roads are physically separated,
> not when a white line is painted. Lane mapping would get you reverted.
> 
> > this way routing engines will regard them as separate roads and stop
> > trying to get you from one lane to another.
> 
> OSM is not only for car routing. Imagine a chicken wants to cross the road,
> and stumbles over all those separate ways just representing lanes.
> 
> > Then do your turn restrictions.
> 
> Turn restrictions are not used for restricting the change of lanes.
> 
> > On 06-Apr-17 04:09 AM, Kevin Kenny wrote:
> >> Do we have a scheme for tagging such a beast?
> 
> You can combine turn:lanes [1] with change:lanes [2], the first describe
> which lane you have to use for which turn, the second where you can change
> lanes and where not.
> 
> [1] https://wiki.openstreetmap.org/wiki/Key:turn
> [2] https://wiki.openstreetmap.org/wiki/Key:change
> 
> If you want to show us the current situation, you can drive along with the
> mapillary app and upload, so you don't need to show outdated G*****
> pictures ;-)

I remapped those parts, but in order to prevent routing engines from turning 
illegally, I had to add a lot of restrictions onto the road, including the use 
of multi via-way where basically no currently available routing engines 
support.

> 
> 
> Thank god I never had to drive own-handed in HK. :-)

Even commercial systems like Google Maps can't be trusted here because it 
cannot handle this situation.

Michael


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