Japanese carmaker Mazda Motor Corp said on Monday it is to join in a project that is developing vehicles powered by fuel cells along with a Japanese unit of DaimlerChrysler AG and Nippon Mitsubishi Oil Corp. Mazda said it will join a test run of fuel cell vehicles planned for early 2001 in Yokohama, south of Tokyo, by DaimlerChrysler Japan Holding Ltd and Nippon Mitsubishi Oil. Such vehicles, powered by electricity generated by hydrogen or methanol, have low-level emissions and are regarded as quiet and energy-efficient. Last October, DaimlerChrysler's Japanese unit and Nippon Mitsubishi started working together in Japan to promote fuel cell vehicles.