Hi!

Are you sure you are doing these highway area conversions correctly?

My understanding is that `area:highway` is the geometry of a 
single road - basically representing the same thing as the road way, but full width/shape. It is generally implied all travel happens along the main way and not everywhere in the area. On the other hand, `highway` + `area=yes` is a location where traffic can move in every direction - there is no obvious middle or direction.

https://wiki.openstreetmap.org/wiki/Key:area:highway#Differentiation_area:highway_vs._area=yes_on_a_highway