[Tagging] Tagging for streets with sharrows?

[Mike N.]

> But it's not effectively the same thing.  If it were, sharrows
> wouldn't have ever been invented.
>
> Now, Steve (and Mike), what's wrong (if anything) with
> bicycle=designated; sharrow=yes?


Considering -
  bicycle=yes - not useful; generally implied bicycle=yes can be derived 
from type of highway= and region of the world.
  cycleway=shared_lane, does not describe the situation because existing 
convention treats the cycleway as a separate lane

I'm leaning that way:

 highway=xxxx +  bicycle=designated is similar to the existing highway=path 
+ bicycle=designated case.
  sharrow=yes might be useful to know how it's signed.

 That also raises the question of how to tag differences between opposite 
sides of the road;
   bicycle:left=designated
  bicycle:right=designated