Sighted my all-time US favourite when heading to my daughter's beach house in the Hamptons - a blue metallic Jaguar convertible with the top down in the High Occupancy Vehicle (HOV) lane of the Long Island Expressway, which requires a minimum of two occupants. Occupants in this case, one man and an Alsatian, with the Jaguar sporting the license tag BOLLOX....
I subsequently asked a friendly state trooper if the definition of "occupant" included four-legged friends and, after a moment of reflection, he replied, "Only if it is a seeing-eye dog, Sir"!
Jack