(mainly, UK, Ireland, informal) [of an emergency vehicle] with the blues and twos switched on.
He glanced at his watch. “Blues and twos,” he said. “I want to get there before the train.” [...] They pulled out of the forecourt at the rear of the police office and drove straight across into Vauxhall Bridge Road, ignoring the one-way…
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(mainly, UK, Ireland, informal) The flashing lights and loud siren of an emergency vehicle.
Five minutes later, Bella, efficient as ever, radioed him back with an address near Hove station, about ten minutes drive away, going soberly, or ninety seconds with the blues and twos on.
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