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?
A) You would overload the sensor, so this is an excellent method for forcing all lights to turn green.
B) The circuit would detect the absence of magnetic flux, thereby working normally.
C) The sensor would signal with the opposite polarity, indicating you've already gone through the intersection.
D) The sensor would not notice you or your vehicle, and you'd be stuck at the red light.

Question

Quizplus · Accepted Answer

Vehicle sensors embedded in the road surface work by detecting changes in the magnetic field caused by the presence of metal objects such as cars. As a plastic car has no metal parts, the sensor would not detect it and therefore would not register the presence of the vehicle. This would result in the driver being stuck at the red light until another car with metal parts came along and triggered the sensor.

What Would Happen If You Had a Car Made Completely