the first time i got my hands behind the wheels in the circuit i
asked the instructor "how to know if i in lane anot?" and he begins
to tell me all sorts of way to judge where am i, am in in lane or
anot straight anot. but in the end i found out the best method is
to have the feeling.
in ur case, there's lots of way shoulder in line then turn, turn
abit when side mirror touch line and many more. but in the end i
guess must have the feeling. with more practise i think it should
be juz fine. 
