Why some times riders starts from the middle of the track ?

https://i.redd.it/pymv1grkatv01.jpg
Submitted May 04, 2018 at 10:57AM by zikzakofficial https://www.reddit.com/r/motogp/comments/8gy2r1/why_some_times_riders_starts_from_the_middle_of/?utm_source=ifttt