I always thought that shaded areas such as this were there to give the added effect of a worn in surface on corners and things. I may well be wrong though. As for the proper name, id say racing line.
In trail riding it's called a berm. It's the path layed down by others, and it's both the quickest way around a corner, and also the grippiest. I'd call it a berm, or maybe the racing groove. I wouldn't call it a racing line, as the quickest line is not necessarily the racing line
I never knew that! I thought that the racing line is the shortest possible course around the track, making it theoretically the fastest. I am however, an expert at being wrong!
I believe they are called 'ruts' or something dougie
Nah, a berm, at least over here, is a banking on the outside of a turn which riders use to get more speed up.. I think