How does the camera distinguish and localise a noisy car amoung 20-30 normal cars. Even with directional microphones automated fines may be indiscriminately is

How does the camera distinguish and localise a noisy car amoung 20-30 normal cars. Even with directional microphones automated fines may be indiscriminately issued for potentially just being near one or behind one. This system needs to be close to perfect so to not distract innocent drivers with the idea of a rogue fine, in turn cause a driver to stress and elevate road risk.