Well I don’t currently have any DX10 issues to fix!
I have heard mention of cars with black headlights, but I cannot find any. Here are some reasonably generic parked cars which look ok to me. If you look carefully above the white and beige ones there is a faint line – which suggests that the boundary of transparency in texture is wrong, buts that all I can see.
Here is a motorway – looks ok with same very minor flaw.