From Mengzi to Yuanyang Rice Terraces, the fastest way is usually to drive or take a long-distance bus. Self-driving cars can plan routes according to navigation or maps and choose the nearest highway. If you choose to take a long-distance bus, you can first take a long-distance bus to Yuanyang from Mengzi Bus Station, go directly to Yuanyang County, and then transfer to local transportation to go to the terraces. The specific route and time depend on road conditions and transportation methods. It is recommended to check the latest traffic information before traveling.