Algodoo

The information also comes from Bilibili. These flags appear quite often in racing.
One thing worth noting is that the number on the 'Number 60 Flag' is actually supposed to be in the Impact font, but I was lazy, so I just wrote it by hand.

By the way, it is also open-sourced. Do not credit to me when using these, because the flags are not designed by me. I'm here just for documenting and making them avaliable on Algodoo.