You seem to miss the point entirely (which most slashdotters tend to do).
How do you propose the dash-cam make the ambulance reach an accident faster?
You talk about waste of money - so I have to ask you, what is a life worth in your opinion? Because if the system saves lives, is it still a waste of money?
And before complaining about "taking over", FFS read up on what RDS is (https://en.wikipedia.org/wiki/Radio_Data_System), And if you are driving in a car it is your frickin responsibility to make use of any information available to get as a complete picture you can of the traffic situation so you can drive safely. If you think it's an undue burden to have your music interrupted by a message that can save lives please sell your car.
And you couldn't even get the thing about bad drivers right, one bad driving habit is LACK OF COMMUNICATION! You know like . . . eye contact! Or using the turn signal! Or being oblivious to the traffic around you because you can't hear it over your stereo blaring.