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Black and white is an American slang term for a police car that is painted in large panels of black and white, or generally any "marked" police car. Historically, this scheme is much favoured by North American police forces because it allows the unambiguous recognition of patrol units from a significant distance. However, as the colour scheme is not standardised, each police agency in Canada, Mexico, and the U.S. can choose their own colour scheme.
The most common variant of the black and white colour scheme is a white roof and four white doors; the second most common is the two front doors and roof painted white.
In Finland and Sweden, the black-and-white police cars had black roofs to make them visible in high snow. In European police forces, a colour scheme with blue and white is very common. In Spain, green and white is used by the Civil Guard, and in Germany, green and white was standard, mainly in the past.