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Does seem silly I agree :) But something like it does exist. Bose audiopilot uses a microphone in addition to a vehicle speed link.
If the method is linking to the ECU and not a build-in microphone, it would indeed explain why I can't hardly find any radio with that function....
Does somebody have a car radio installed that goes louder when there is more outside noise, for instance when you go on a motorway or drive with...