Hybrid Cars -- they should be noisier!

From The Week magazine:

A proposed law in Maryland that would promote the use of eco-friendly "hybrid" cars is being opposed by advocates for the blind -- because hybrid cars are harder to hear. "We use the sound of the traffic not only to determine when to cross the street but to navigate," said Chris Danielsen of the National Federation of the Blind, "and hybrid vehicles are silent." The NFB is asking that the law be amended to require hybrids to make noise.

Maybe they could each have it's own little chime sound, like our cell phones.