Do I need one LHT and one RHT headlight for my vehicle?

A: No. LHT means “Left-Hand Traffic” and RHT means “Right Hand Traffic,” referring to which side of the road a driver uses.

For instance, a driver in the UK is Left Hand Traffic and would use two LHT lights; a driver in Canada is Right-Hand Traffic would use two RHT lights. Do you refer to it as RHD (right-hand drive)? RHD = LHT (left hand traffic), LHD = RHT (right hand traffic)