In WA, an auxiliary plate is the extra number plate you fit when your bike rack, tow carrier or load hides the rear rego—because police can’t read minds.
It shows your vehicle’s registration and is issued to that vehicle, not for swapping between the family fleet.
Mount it at the rearmost point of the load, keep it clean and visible, and make sure it’s illuminated at night.
Apply through the WA Department of Transport or a licensing agent; expect a small fee and bring ID and your rego details.
Home‑made photocopies or texta‑on‑cardboard specials are illegal and will earn you more than a disappointed look.
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