The Dawn replaced the Phantom Drophead Coupe as Rolls-Royce's open-top car. Rolls-Royce built it on the Ghost platform, rather than the Phantom's. Its redesigned convertible roof drops in 22 seconds. Power comes from a twin-turbo V12 through a ZF eight-speed automatic. Here we have a 2017 Dawn in English White, with rear-hinged coach doors.