I think, as in most cases this is a matter of respect for other drivers. If i join mid-race, i always keep of the main line as soon as i get a blue flag, and before pitting out, i make sure i wont cause any potential danger to racing cars. As i see it, the racing rules doesnt ever grant you any rights, only obligations. Some people drive like they own full right to the track, and as i have seen, it often leads to them going into a wall. A blue flag means, youre obligated to let the leading car pass as soon as it is considered safe, but it grants no rights to the leading car. If that would have been the case, i think the leading car would be getting a flag message like: "blue flag, youre good to pass" or something similar. When i drive, i use my common logic sense to take descisions on what action to take at any given moment. I can actually get enjoyment out of just driving accurate and polite, (i think it adds to the reality of the simulation) and i have noticed, that even if i aint the fastest car around, i have sometimes gained high positions by just taking it a little calm and showing some respect while others crash all over the place...