approach angle
maximum angle of a ramp onto which a vehicle can climb from a horizontal plane without interference
en-US/əˈpɹoʊt͡ʃ ˈæŋɡəl/
en-GB/əˈpɹəʊt͡ʃ ˈæŋɡəl/
maximum angle of a ramp onto which a vehicle can climb from a horizontal plane without interference