Indianapolis - Rolls-Royce became the second car maker to announce it will offer HD Radio as a standard feature across all its 2010 models, joining Volvo.
In addition, Mercedes-Benz said it will add HD Radio to all 2010 models with premium feature packages. These include the E-class coupe, and E-, CL-, CLS-, S- and SLK-class vehicles
New Rolls-Royce models with HD Radio include the Phantom series, said iBiquity, developer of HD Radio. Rolls-Royce began offering HD Radio in vehicles in 2007.
Other car makers offering HD Radio either as optional or standard equipment in some models include Audi, BMW Ford, Hyundai, Kia, Land Rover, Lincoln, Mercury, Mini USA and Scion.
HD Radio stations are available to 85 percent of the U.S. population, according to iBiquity. More than 2,000 HD Radio stations are on the air, and many of the FM stations are multicasting more than 1,000 HD2 and HD3 programs simultaneously with their main program.