JD divides the mainland market into seven regions - North China, East China, South China, Northeast China, Central China, Southwest China and Northwest China, and has established logistics centers and central warehouses in seven central cities, including Beijing, Shanghai, Guangzhou, Shenyang, Wuhan, Chengdu and Xi'an. This is the first level of logistics; due to the huge area covered, forward warehouses are set up in cities such as Jinan, Nanjing, and Chongqing to store fast-moving goods, rather than storing all categories. This is done to speed up the response to users in second- and third-tier cities, speed up timeliness, and improve user experience. This is the second level; further down is the distribution center, the fourth level is the transfer station, and the fifth level, the terminal level, is the delivery station. Delivery personnel depart from the station and use vans, tricycles, and motorcycles for delivery.