on using automatic traffic light controll by using sensor like mag. field will it cause any stray effectoncar?

Question

on using magnetic field the enviorment has magnetic effect will it cause stray effect on the automobile performance ?

Answer 1

Those loops are very weak magnetic field, so anything that weight much less than a car -- like an empty can from discarted trash or something -- would not trip it.
A car already has components using much higher magnetic fields, like the alternator, or the ignition coil. Any effect the magnetic sensor of the traffic light system could have on a car would be unmeasurably low.

Answer 2

Those buried electromagnets are called 'inductive loops.' They are too weak and remain too close to the ground to interfere with on-board electronics.

Answer 3

No.