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Security lighting to prevent intrusions may be counter-productive. Turning off lights halved the number of thefts and burglary in Övertorneå Sweden. [2] [3] A test in West Sussex UK showed that adding all-night lighting in some areas made people there feel safer, although crime rates increased 55% in those areas compared to control areas and to the county as a whole.
Sensors: In a security alarm, some sensors detect intrusions. Sensors' locations are at the perimeter of the protected area, within it, or both. Sensors can detect intruders by different methods. Alerting devices indicate an alarm condition. Most commonly, these are bells, sirens, also and or flashing lights. Alerting devices serve the dual ...
For Law Enforcement Motor Vehicles, they are permitted to use red, white, and blue lights with sirens, while fire trucks can use red and blue lights with sirens. Ambulances are only allowed to use blue lights and sirens, and tower service cars and wreckers can only use yellow lights without sirens.
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These exemptions apply whether or not blue lights and/or sirens are being used, although it is mainly desirable: [5] treating a red traffic light as a give way sign [6] passing to the right of a keep left sign or to the left of a keep right sign (but not disobeying a turn left, turn right, or ahead only sign) [7]
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