Most police vehicles in Hong Kong are white, with a blue and red 3M retroreflective stripe around on the sides of the vehicle with wording "警 Police 察" in white, the only exception being the armoured personnel carriers specially designed for the Police Tactical Unit, which are wholly dark blue and with wording "警 Police 察" on a light blue background in white on the sides of the vehicle. Most police vehicles in Hong Kong are equipped with both red and blue emergency vehicle lighting. The vehicles which are assigned to airport duties have additional yellow emergency vehicle lighting and yellow rooftops required for all airport vehicles. All police vehicles are government property and so bear licence plates starting with "AM".