This topic has come up before on EM. My response: as a cyclist, I can tell you that efficient cars with good exhaust systems (so, most new compacts and green cars) can really sneak up on you. I maintain situational awareness using my ears, especially if I have to move in to traffic to make a left turn, or to avoid a hazard in my lane. A car with large, loud tires or a leaky exhaust can easily mask a Prius or a Civic, even once the loud car has passed and is pretty far away.
I don't think any legislation is needed, just extra caution on the part of all road users.
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