Originating from 'L Plate'; a square white sign with a red letter L on it, displayed on the back and front of a vehicle driven by a person who is learning to drive in the UK. L Plates are removed from the vehicle once the person is a qualified driver. See l-plate
L plates = learner driver
P plates = probationary driver (not yet full licence)
V plates = virgin
2:"Yeah, but i've lost a couple of demerit points tho... ;) "