Cars have gotten so quiet now we can’t rely on hearing anymore, iPod or not. Hybrids in electric mode as well as electric city buses are dangerously quiet. A hybrid leaving a curb makes no warning sounds of imminent movement so it’s all up to the driver to look around. Things have gotten too quiet and we need stereo sounds of some kind added to vehicles. A low bass sound, if loud enough, can be heard by the body no matter what someone’s ears are listening to. Directional subwoofers could be added to locomotives to shake the bejesus out of people on the tracks.
Electric cars and hybrids will play “La Macarana” as they roll by now...
So don't. Look both ways. Crossing the street is not rocket science!
Already available: Police and drivers get ready for Rumblers