Emergency service response codes are predefined systems used by emergency services to describe the priority and response assigned to calls for service. Response codes vary from country to country, jur
A police radio dispatcher's desk from the Netherlands
Emergency vehicle equipment is used in the United Kingdom to indicate urgent journeys by an emergency service. This usage is colloquially known as "blues and twos", which refers to the blue lights and
Emergency service response codes
…The use of flashing lights and sirens is colloquially known as blues and twos, which refers to the blue lights and the two-tone siren once commonplace (although most sirens now use a range of tones). In the UK, only blue lights…
An Incident Response Unit operated by Norfolk Fire and Rescue Service with a blue lightbar on top, alternately flashing LED lights on the front, and flashing headlights. This vehicle is part of the New Dimension programme and consequently does not carry any insignia of Norfolk Fire and Rescue Service.
Six Metropolitan Police Service motorcycles driving with the blues and twos on. They can be seen breaking a number of normal traffic rules. Each motorbike has driven through a red light, and the motorbike on the far right can be seen driving on the wrong side of the road and passing on the right of a keep left sign.