[Tagging] Tagging 'advance' turn restrictions

[Warin]

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.

Then do your turn restrictions.

On 06-Apr-17 04:09 AM, Kevin Kenny wrote:
> Near where I live, there are several places where lane restrictions 
> continue for several city blocks. These 'advance' turn restrictions 
> are confusing to human drivers, and so far it seems that navigation 
> systems can't cope with them at all. I'm wondering if it's even 
> possible under our current schemes to tag them.
>
> Here's a typical example.
>
> Nott Terrace, approaching Eastern Avenue/Liberty Street. 
> https://goo.gl/maps/thBW7UYMBDy
>
> The leftmost lane may go straight or turn left on Liberty Street. 
> Traffic going straight will be required to turn left at the next 
> intersection (Union Street), and proceed straight on Union Street at 
> the following intersection.
>
> The center lane must go straight across Eastern Avenue. Traffic in 
> this lane will be required to turn left on Union Street, and then will 
> be required to turn right on Seward Place.
>
> The right lane may turn right on Eastern Avenue, or may proceed 
> straight. Traffic going straight will be required to turn right on 
> Union Street.
>
> The restrictions on traffic going straight are confirmed by signage at 
> the next intersection https://goo.gl/maps/Soy6NxDprBG2 - the left lane 
> must go west on Union Street, the center lane north on Seward Place, 
> and the right east on Union Street.
>
> The pavement markings are in poor condition on the Google Maps images, 
> but recently refreshed to show solid white lines between the lanes 
> throughout this entire stretch. There is essentially no opportunity to 
> change lane in this sequence, so a driver must choose the appropriate 
> lane when approaching Eastern Avenue from the south, committing to a 
> series of actions through the next three intersections.
>
> Not shown in Google Street View yet, but present on the ground, are 
> equally confusing restrictions on Nott Terrace approaching State 
> Street in the opposite direction. One lane must turn left on State 
> Street, the next lane goes straight through that intersection but 
> turns left on Albany street, and the third line either turns right on 
> State or goes straight through onto Veeder Ave.
>
> Do we have a scheme for tagging such a beast? I've been reading 
> http://wiki.openstreetmap.org/wiki/Relation:restriction which appears 
> to be the closest thing I've found on the Wiki, but I'm having trouble 
> putting the pieces together to describe these situations. I'm guessing 
> that I'm missing something.
>
>