I saw Mats video on German signals and safely system witch I thought was brilliant. But I think something like that should be in the game. Or at the very least on the TSW2 website.
Why would you want this in game specifically? I much prefer online tutorials and videos where you can pause, rewind and view comments from others (which often give good context to a point being made on screen). A great example is below of a video which gives excellent depth of knowledge which you wouldn't be able to achieve in game
I would buy manuals that had examples of signals and signs used and how to enable and use the safety systems for each route and DLC route. Really would have improved TSW 2 for me.