The Mundrabilla Encounter, or The Knowles Family Encounter.
This encounter ends in South Australia, but the family was traveling from W.A, and it is where the majority of the encounter occurs.
It is also one of the biggest, famous or most known encounter which wont be expanded upon in this post.
See this Article from AP News January 21 1988 and this from the ABC in 2018 for more details.
This encounter is also covered in:
UFO Research Australia newsletter vol 7 no 1, May 1989 and the vol 6 no 1 April 1989 edition is dedicated completely to it
Family Says It Was Chased By UFO, Police Say No Hoax
Sources & Links