AutoCAD Map 3D :: Text Annotation Parallel To The Line?

What I have is a shape files that contains the road centreline of a city I am working on. And that shape files also have a data of its road name etc.

I know how to do it as FDO (using map connect). But what I require is an autocad text entity.

I can save the map as a drawing. But what I only want is just a number of road names and they are not adjacent or near to each other so map filtering is not recommended.

So what I did, I add the shape files using map import command and added the road name data. And then, I used the command Annotation and do the "define annotation" and "insert annotation". From here, I am doing fine. I created a text/block annotation that will extract the road name on the imported centreline on the line I just selected.

Now, my problem is, all the text are in just one direction (in my case they are all horizontal). I tried playing the "rotation expression" but still without luck.

how or what "rotation expression" should I use to make the text parallel/along the centreline.