In a racing or trackday sense, line selection is about speed and efficiency. Choosing a line that permits a higher entry speed into the turn, the greatest mid-corner speed, or the best drive out obviously depends on the turn. Beyond the theoretical best line, you might need to alter it to set up for a pass on the entry or exit of a turn or even in the middle of the corner. You will choose a different line when it’s advisable to “pick the bike up” earlier on the exit of the turn. One to strategically drift to the middle in a double-apex turn, which is the proper line to set up for the second part of it, applies there. Then, too, lines will vary depending on horsepower. Generally wide and swoopy for lower power, and more point and shoot for motorcycles with big grunt coming off the corner.