On Sun, Sep 12, 2010 at 3:09 PM, John F. Eldredge <[email protected]> wrote:
> Tagging oneway=yes on a motorway is an example of tagging a special case.  
> The general assumption on roads is that they are two-way unless tagged 
> otherwise.  Tagging the motorway as oneway=yes makes sure that routing 
> calculations will work correctly.  Sections of motorways sometimes become 
> two-way (usually with a safety barrier down the middle) when the other half 
> of the motorway is closed for road construction.

Actually highway=motorway implies oneway=yes:
http://wiki.openstreetmap.org/wiki/Tag:highway%3Dmotorway

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