Ricochet
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Linger On The Outside.
A subtle variation is shown in B. The rider pulls the line inward and decreases the distance to the inside lane edge. When the distance to the inside edge is least this point is called the APEX of the corner. This is the classic line.
If the view around the corner is blocked by terrain or vegetation a safer line is shown in B1. The rider moves to the outside of the corner before the corner entrance then clips the apex in the middle of the corner before smoothly moving to the outside of the lane heading for the corner exit. By lingering on the outside at the entrance of the corner the rider can see further into the corner. He extends his sight line past the vegetation or terrain and has more distance (time) to cope with obstacles as they come into view. The apex is still roughly in the middle of the corner. This is the outside-inside-outside line.
Good advice. Only thing I would add is that if you are riding unfamiliar roads or even in twisties you are relatively familiar with, on a right curve leave yourself enough room to the outside (your left) that you won't kiss the windshield of the inevitable cager that is going to cut the corner and cross the line. Usually 2-3 ft from the outside of the mirror is a good margin. Unless you just have awesomely fast reaction time and mad recovery skills (which if you're a beginner, you won't) you will thank yourself the first time the cage mirror zips by your mirror/head.