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A police code is a brevity code, usually numerical or alphanumerical, used to transmit information between law enforcement over police radio systems in the United States. Examples of police codes include " 10 codes " (such as 10-4 for "okay" or "acknowledged"—sometimes written X4 or X-4), signals, incident codes, response codes , or other ...
The movie Convoy (1978), loosely based on McCall's song, further entrenched ten-codes in casual conversation, as did the movie Smokey and the Bandit. The New Zealand reality television show Ten 7 Aotearoa (formerly Police Ten 7) takes its name from the New Zealand Police ten-code 10-7, which means "Unit has arrived at job". [citation needed]
Code 1: A time critical case with a lights and sirens ambulance response. An example is a cardiac arrest or serious traffic accident. Code 2: An acute but non-time critical response. The ambulance does not use lights and sirens to respond. An example of this response code is a broken leg. Code 3: A non-urgent routine case. These include cases ...
In a pneumatic siren, the stator is the part which cuts off and reopens air as rotating blades of a chopper move past the port holes of the stator, generating sound. The pitch of the siren's sound is a function of the speed of the rotor and the number of holes in the stator. A siren with only one row of ports is called a single tone siren.
CBS News said in their caption that the sound was so accurate that some officers thought that their vehicles' sirens might have been faulty. Inspector Simon Hills described the mimicry as “so ...
A siren was used in Bob Dylan's classic album, Highway 61 Revisited. One is also heard in Stevie Wonder's song "Sir Duke" just before the second chorus. Dan Zanes also uses a siren in his version of "Washington at Valley Forge." Acme is the trade name of J Hudson & Co of Birmingham, England, who developed and patented the Acme siren in 1895. It ...
A typical siren found on police stations in Taiwan, seen with loudspeakers around it. Either the yellow mechanical siren or the surrounding electronic sirens are in service. Taiwanese civil defense sirens are erected on police stations and commanded by the nation's Civil Defense Office (民防指揮管制所). The government issues air raid ...
San Francisco, California - This system is unique featuring the sound of the decommissioned Federal Signal STL-10 sirens that the HPSS units replaced; Casitas Dam, Ventura, California - This system is unique as they look like the Federal Signal Directional Speaker Array (DSA) sirens, but can have 7–8 speakers per stack, and gray caps on the speaker cones.