@fukuda: As I said elsewhere, you wouldn't find something like this in Germany.

On highways, lanes in different directions have to be separated by a barrier (this is even the case in a construction area). Since the highway is still two tiles wide, have you considered moving the barrier in the middle, so the highway gets four "true" lanes in each direction?
@sisum: Yes, the first two pics show a Highway On Slope Puzzle Piece.

It will be included into the next NAM. As far as I know, the monorail bridges won't be modified, but there are quite a few bridges available already, and more are in the making. Just keep your eyes open. In the future, new bridges won't have to be included into the NAM, but it's possible to download them individually. The only file that needs to be updated (and downloaded again whenever you install a new bridge) is the NAM Bridge Controller file that is already available at the SC4D LEX.