That's totally sufficient for airplanes since crossing semi-trailers are fairly rare on airways. Jokes aside, all obstacles for airplanes are radar tracked, so

That's totally sufficient for airplanes since crossing semi-trailers are fairly rare on airways. Jokes aside, all obstacles for airplanes are radar tracked, so keeping attitude is all that it needs doing. If human intervention is needed, the system usually has time to warn. Still, even those super-simple systems fail.