Don't understand, why vehicles work in other games, but not in Icarus.
Icarus seems to have problems with graphical rendering. I have a RTX 3090 and Icarus can bearly do 60 FPS on 2k Mon, while I game Dayz on 120 FPS on High settings. It seems that all Area (even if not looked by the player) is rendered in full detail or sth. And even then, when you enter a cave or sprint in a new chunk, the area is not loaded fully.
As an enthusiast of Icarus, I am really curious, if the development is working on bettering the graphical rendering, and furthermore planning to add vehicles, later, when rendering is fixed?