How to arrange the nail straps needed by the express train 14?

Look in the rearview mirror. It is best to put it when the opponent is between 5 and 30 meters behind you (preferably directly behind). Put it in advance, about half a second to one second in advance. If the opponent is too close or too far away from you, or much faster than you, it is not recommended to let go, and it is easy to miss. Also, when there are many opponents, it is best to put them in the back. With luck, maybe I can get a few (my highest record is to scrap three police cars at a time, including a Bugatti).