Ford Motor on Wednesday said it would offer high-definition digital radio on nearly all 2008 model year Ford, Lincoln and Mercury vehicles as a dealer-installed option. Ford said digital radio could also be installed on earlier models from 2005, 2006 and 2007. U.S. radio operators are working aggressively to promote HD radio, which receives over-the-air terrestrial stations with CD-quality sound and multiple new-program formats, in an effort to better compete with ever-increasing digital music options. The industry has pledged to spend $250 million on marketing through the HD Digital Radio Alliance. Hyundai, BMW and Ford-owned, Britain-based Jaguar had previously announced plans to offer HD radio. General Motors and Chrysler Group have not yet committed to the devices.