What would happen if you had a car made completely of plastic, with no metal par

Question

What would happen if you had a car made completely of plastic, with no metal parts, and you drove over a vehicle sensor embedded in the road surface?

You would overload the sensor, so this is an excellent method for forcing all lights to turn green.

The circuit would detect the absence of magnetic flux, thereby working normally.

The sensor would signal with the opposite polarity, indicating you've already gone through the intersection.

The sensor would not notice you or your vehicle, and you'd be stuck at the red light.

I'm thinking it is the last option but I'm not sure

Explanation / Answer

Correct answer is

The sensor would not notice you or your vehicle, and you'd be stuck at the red light.

This is because The vehicle sensor works on principle of induction loop. On the road surface a groove is cut and wires are laid down to have an inductance and connected to some sourece. This circuit resonates at a certain frequency. When a metal car comes over the road surface area due to magnetic induction the inductance of the loop changes and hence the resonant frequency changes which is detected by the traffic signal.

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