Ultrasound transducers are not the only producers of ultrasound, nor the loudest. Most things that vibrate create ultrasound, including almost anything that mo

Ultrasound transducers are not the only producers of ultrasound, nor the loudest. Most things that vibrate create ultrasound, including almost anything that moves. Noise pollution is mostly produced accidentally. Also, nocturnal bats will largely be unaffected by cars in no small part because they don't cohabitate with humans very much.