Hi,

attached is a patch that should fix cosmetic issues with merge-lines and oneways.

The idea:
1) merge-lines should not merge two lines if one is a oneway and one is not
2) merge-lines should not merge two oneway lines if the angle between the two ways is too small (< 30°).
Not sure what it does with roundabouts.

Please try this if your style creates overlays for oneways. I don't expect any changes in routing.
Compiled version is here:
http://files.mkgmap.org.uk/download/123/mkgmap.jar

@Steve: Please can you check if the implemented test reg. bearings makes sense?

Gerd