Whats wrong with this roundabout ?

When I check right now the data, the tag "man_made=embankment" is removed. But I would guess that could be a rendering issue. Combining these two attributs is a bit dangerous for a roundabout since both of them are depending on the direction of the way (the transport flow for the roundabout and the high/low side for the embankment). What I could advice is :

- read the wiki about embankment. It says that "embankment=yes" is much more popular in OSM (something I verified with taginfo). The direction of the way is important : cf "Add man_made=embankment to a way with the left-hand side of the way being the high side and the right-hand side being the low side"
- It also says that you can micro-map the embankment by tracing separate ways (detached from the highway)
- in general, you don't need a "oneway=yes" on "junction=roundabout". This is probably the only case in OSM where oneway is clearly implied (it's more controversial for motorways).