ELI5- How does the automatic spoiler work on vehicles?

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I often see vehicle get on the highway and the spoiler comes out. How does that work?

In: Engineering

Generally on non high end vehicles a certain speed will trigger it to rise via hydraulics and then if speed is lowered it will fall. On very high end vehicles certain speeds will trigger more precise levels to get optimal down force (vaccum to the ground essentially). Hipe that helps!