[Tagging] bicycle=no

[Mike N.]

> - bicycle=no           -> you are not allowed to ride a bike
> - bicycle=prohibited   -> the presence of bikes is not allowed
> - bicycle=folded_only  -> you can have a folded bike
>
> I would hope this covers most cases.

  There is the odd case of fragile and protected nature trails which connect 
2 mountain bike trails.  For that case, the only rule is "no rolling tires 
on trail" , and bikers carry the bikes on their shoulder, but not folded.