Hi Andrzej,
Reg. your patch: Do I get this right that you don't want to make these areas routable?
In most cases there is routable way across area and adding area boundary only clutters the map. I prefer to remove boundaries, but I can't claim that this is a better solution.
Maybe other developers could add their opinions?
Just one other point to consider: If such an area has a name it is likely that we find houses using this name in addr:street. These addresses will not be found when there is no other road with the right name. Maybe it is possible to implement a check which adds only adds these highways to the map when they are either needed for address search or for routing. I have no idea how complex the test for the routing would be. Gerd