As much as I hate traffic noise, I don't want to have people driving around in completely silent cars. Electric scooters are very popular in New Delhi (see http

As much as I hate traffic noise, I don't want to have people driving around in completely silent cars. Electric scooters are very popular in New Delhi (see http://www.heroelectric.in/ http://www.heroelectric.in/; I even own one of those), and they barely make a sound. More than once I've been startled by a scooter approaching from behind. Moreover, it's impossible to account for them when I'm on a bicycle.