> 2) if the cyclepath is going where you're headed, 
> you are obliged to use the cyclepath, to the 
> exclusion of all other "carriageways"

> I think number 2) is intended here?

Yes, the original was an unreviewed sentence. In the original the "if" only 
applies to "only", not to "may". 

Normally in routing, the slight preference given to cycleways for a cycling 
route should weed out the driving on road bits with a parallel cycleway, but 
because the difference in the edge costs can't be too radical, without the 
information these tags under discussion try to convey, there are bound to be 
cases where one either gets illegal routes when the cycleway is somewhat 
longer, or long detours along cycleways if the edge cost for roads is much 
higher than the cost for cycleways.

-- 
Alv
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