The background colors of license plates include blue, yellow, white, and black. Blue is the license plate for small vehicles (including small-tonnage trucks), yellow is the license plate for large vehicles or agricultural vehicles, and trainer vehicles, as well as test vehicles for new products. Motorcycles are also yellow cards. White is for special vehicle license plates (such as military, police and racing car license plates) and black is for foreign businessmen and foreign companies bringing their own license plates from abroad. Large civilian cars: black letters on a yellow background; small civilian cars: white letters on a blue background; armed police vehicles: red "WJ" on a white background and black letters; other foreign cars: white letters on a black background; foreign cars for embassies and consulates: white letters on a black background and Hollow sign with the word "make"; Trial license plate: Red lettering on a white background, with the word "Trial" in front of the number; Temporary license plate: Red lettering on a white background, with the word "temporary" in front of the number; Replacement license plate: Black lettering on a white background. In addition, the civil vehicle license plate has the name of the province, municipality, and autonomous region and the code of the licensing and supervisory authority. The number is in English capital letters. Therefore, what you see should be military and police vehicles!