As far as I can see, the only way of solving this for single carriageway roads is to introduce modified tags along the lines of maxspeed:northbound (or south-, east- or westbound). Either direction on any road segment can be matched to one of these, and most (but not all) can be matched to two.

Roger

On 23/01/2013 11:13, Richard Hartmann wrote:
On Tue, Jan 22, 2013 at 2:29 PM, Philip Barnes <[email protected] <mailto:[email protected]>> wrote:

     You would only need to do that on a single carriageway road. The
    A995 is dual-carriageway so its just a case of tag each
    carriageway with its speed limit.


Indeed. Thanks for pointing that out.

    I have never seen a single carriageway road with different limits
    in each direction.


http://www.openstreetmap.org/?lat=48.76677766442299&lon=9.183344542980194&zoom=18

That bend is 40 km/h going south, 50 km/h going north.


Richard


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