In China, leading tech companies like Alibaba, JD.com, and Meituan are rapidly deploying autonomous delivery carts to address a looming labor shortage caused by a shrinking working-age population. These self-driving vehicles function as mobile pickup lockers, navigating public roads and private campuses to deliver meals and parcels via smartphone notifications and QR code access. Beyond simply cutting costs, the technology aims to solve security conflicts at gated communities and improve safety by reducing courier accidents. The core challenge has shifted from basic hardware engineering to mastering operational logistics, such as managing temperature-sensitive goods and integrating with smart elevators. As these firms move from pilot tests to large-scale implementation, unmanned carts are becoming a standard feature of the Chinese urban landscape.