SAFETY & REGULATORY DEVICES

In the Safety & Regulatory Devices section you'll find tools and technology intended to keep drivers and passengers safe, from car seats and airbags to red-light camera technology.
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How does a traffic light detect that a car has pulled up and is waiting for the light to change?

There is something exotic about the traffic lights that "know" you are there -- the instant you pull up, they change! How do they detect your presence?

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