How to knock down a rooftop stand? (Forza Horizon 4)

there you just need to find some kind of bump or hill nearby in order to use it as a springboard for approach. in general, on YouTube you can watch video manuals for collecting all the stands.

there are rumors that you need to make jumps, raise the level for danger signs and then trampolines will appear, how much this is true, I do not know

Mistmaster_YT
Ambush place. I didn't knock him down myself.

On the other side of the house there is a mound - jump from it. I myself knocked down 3-4 attempts at one time. And if you smear, then there is always a rewind of time and you can easily adjust the trajectory of the jump.

Why google or search on Youtube if you can ask on the Playground and wait a day for an answer.