For 2006, the Acura RL was also offered in a second trim level, the optional 'Technology Package' which included three new features adaptive cruise control (ACC), Collision Mitigation Braking System, and Michelin PAX System run-flat tires on unique PAX 235 mm x 460 mm A ("A" for asymmetric) aluminum alloy wheels with unique 245-680R460A Michelin Pilot HX MXM 4 all season grand touring type radials designed for the Michelin PAX System. The metric sized, run flat Michelin PAX System wheels and tires are equivalent to 18" x 9" wheels and 245/45-R18 conventional tires.