other sections, it uses different exit numbers than those employed on the rest of the expressway (in which kilometre zero is at the San'an interchange). Instead, the exit numbers reset, with the Gaoling interchange serving as kilometre zero for this section. This section of expressway is toll-free. Just south of the Gaoling interchange, all motorists must stop at a toll booth. Immediately after the toll booth, the Nahong exit provides access to and from the city centre of Nanning from the south. The Nanning Airport Expressway section of the Nanning–Youyiguan expressway traverses through Jiangnan District in a southwesterly manner, ending at the Wuxu exit, where it connects to Airport Road and Nanning Wuxu International Airport. Wuxu to Youyiguan The final section of expressway, from the Wuxu exit to the Vietnam border, is in length. This section of expressway is tolled from the Wuxu exit to the Pingxiang exit. West of the Wuxu exit, motorists must stop at a toll booth. The expressway enters the prefecture-level city of Chongzuo immediately after the Suxu exit. At the Yuanjing exit, the Nanning–Youyiguan Expressway connects with the S60 Qinzhou–Chongzuo Expressway to the east. This exit opened along with the opening of the Qinzhou–Chongzhou expressway on 31 December 2012. The expressway passes just south of the city centre of Chongzuo, before continuing west to the county-level city of Pingxiang. The section of expressway between the Wuxu and Chongzuo exits has a speed limit of . The speed limit between the Chongzuo and Ningming exits, just before Pingxiang, is , and between Ningming and Youyiguan is . The section between Ningming County and Youyiguan parallels much of China National Highway 322 and the Hunan–Guangxi Railway. Entering Pingxiang, motorists must stop at a toll booth, marking the end of the tolled stretch of expressway. Immediately after the toll-booth is an at-grade intersection with China National Highway 322 and Jinxiang Avenue, the only at-grade intersection on the expressway. The expressway makes a sharp turn southward toward the Vietnam border and its southwestern terminus at Youyiguan. At Youyiguan, individuals must pass through the border checkpoint before entering Vietnam. On the Vietnamese side of Youyiguan is the northern terminus of North–South Expressway. Exit List References AH1 Chinese national-level expressways Expressways in Guangxi