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How do traffic lights which can be changed by police work?

Updated: 8/19/2019
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13y ago

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There are multiple types of controls for traffic lights.

1) Signal control box can be used to change the lights as needed.

2) Some cities have remote systems that can be controlled by a central office.

3) near the traffic lights there are sensors. these sensors can see and distinguish emergency light from vehicles approaching and automatically change the lights for passage.

4) some lighting systems also recognize radio frequencies transmitted from emergency vehicles and change lights accordingly.

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Q: How do traffic lights which can be changed by police work?
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