This is the best summary I could come up with:

Mercedes-Benz has just received approval to add a fourth color: turquoise blue lights that indicate when a Mercedes car is driving itself.

Mercedes Drive Pilot can be used in traffic jams on selected major highways when vehicles are traveling at less than 40 miles an hour.

In the meantime, drivers can surf the Internet or play games on the car’s big center screen.

It’s not similar to the color of any other lights on a passenger car but it’s also clearly different from the darker blue used by police and other emergency vehicles.

The Society of Automotive Engineers recommends this specific blue shade to signify autonomous vehicle operation but Mercedes is the first automaker to receive approval for its use.

The turquoise lights are needed, according to Mercedes, to alert passing drivers and police that the vehicle is under fully automated control.

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