Oregon License Plates
Apportioned plates are used on trucks and buses operating in more than one jurisdiction as part of the International Registration Plan (IRP). Oregon "DOT" apportioned plates were white on red, but they changed to black on white around 2013. IRP plates are issued in three variations and series:
1. Y AAA123 is for Apportioned single plate
2. Y APA123 and ARA123 series are both for apportioned pair of plates
3. Y123456 yellow plate for IRP trucks not subject to weight miles tax.