I saw that as well TC.. Also noticed the blue flashing lights in the window and the grill... maybe the Police???
Its a CCT Metro Officers car.
Also known as Ghost cars in SA. Essentially stock standard MK5 and MK6 GTI's but at a flip of a switch LED lights behind the grills, roof liner and front windows come on as well as a siren. The officers driving can stop anyone if they break the law and fine on the spot. Only way you can tell its a CCT car is to check the reg plate. It ends with CCT.
In CPT we also have Astra ghost cars as well as BMW tourers (Bikes) and a M6 for high pursuit driving.
In JHB we have a modded matte black R26 (or whatever it is) for high speed pursuit and the same MK5 and MK6 GTI's.
It was implemented at the end of last year. If you have every experienced our taxi's down here you will see why they work so well.
Mike