(UK) A heading commonly placed on certain notices, such as "no parking" notices, originally intended to be misread at a glance as "police notice", thus imparting a spurious authority, and often using
(UK) A heading commonly placed on certain notices, such as "no parking" notices, originally intended to be misread at a glance as "police notice", thus imparting a spurious authority, and often using similar typography to genuine police notices; may now be meant or read literally by those unaware of the original purpose.
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Slang for a police car, referencing the classic livery of blue-and-white paintwork worn by patrol vehicles in many countries, including the UK and parts of the US. The term strips the vehicle down to its most visible feature — the colour scheme — in the way street slang often reduces authority figures to their most recognisable symbol. Spotting a blue-and-white can signal anything from casual neighbourhood watch awareness to urgent 'heads up' warnings among people who'd rather not be stopped.