Throughout the Horizon series, horns activate when you press and hold R3 on a gamepad. Obviously this makes complete sense for normal car horns. But where this becomes tedious is with musical horns and sound effect horns, as releasing the horn button at any time immediately stops the sound effect without letting it play all the way through to the end.
A similar situation occurs with looped sound effects like the Police Siren horn, as you have to constantly hold down the horn button so the sound effect keeps playing.
A solution to this would be to add a unique property to musical horns and the non-looped sound effect horns so that the effect plays all the way through with a single press of R3. For looped sound effects like the Police Siren horn, have an on/off toggle for the sound.
Now disclaimer: I don’t want to pretend it’s a serious gaping issue because frankly it isn’t. Horns have always been a minor cosmetic feature in the series, so consider this a low priority suggestion. Especially if there’s a risk of breaking something in the game’s code.