River Bridge is the city's only bridge–tunnel complex across Yangtze River. The expressway network within the city center consists of North–South Elevated Road, Yan'an Elevated Road, and Inner Ring Road. Other ring roads in Shanghai include Middle Ring Road, Outer Ring Expressway, and Shanghai Ring Expressway. Bicycle lanes are common in Shanghai, separating non-motorized traffic from car traffic on most surface streets. However, on some main roads, including all expressways, bicycles and motorcycles are banned. In recent years, cycling has seen a resurgence in popularity due to the emergence of a large number of dockless app-based bicycle-sharing systems, such as Mobike, Bluegogo, and ofo. , bicycle-sharing systems had an average of 1.15 million daily riders within the city. Private car ownership in Shanghai is rapidly increasing: in 2019, there were 3.40 million private cars in the city, a 12.5% increase from 2018. New private cars cannot be driven without a license plate, which are sold in monthly license plate auctions. Around 9,500 license plates are auctioned each month, and the average price is about () in 2019. According to the city's vehicle regulations introduced in June 2016, only locally registered residents and those who have paid social insurance or individual income taxes for over three years are eligible to be in the auction. The purpose of this policy is to limit the growth of automobile traffic and alleviate congestion. Railways Shanghai has four major railway stations: Shanghai railway station, Shanghai South railway station, Shanghai West railway station, and Shanghai Hongqiao railway station. All are connected to the metro network and serve as hubs in the railway network of China. And now Shanghai has around twenty railway lines running under this city, which largely facilitate people's life in Shanghai. Built in 1876, the Woosung railway was the first railway in Shanghai and the first railway in operation in China By 1909, Shanghai–Nanjing railway and Shanghai–Hangzhou railway were in service. , the two railways have been integrated into two main railways in China: Beijing–Shanghai railway and Shanghai–Kunming railway, respectively. Shanghai has four high-speed railways (HSRs): Beijing–Shanghai HSR (overlaps with Shanghai–Wuhan–Chengdu passenger railway), Shanghai–Nanjing intercity railway, Shanghai–Kunming HSR, and Shanghai–Nantong railway. One HSR is under construction: Shanghai–Suzhou–Huzhou HSR. Shanghai also has four commuter railways: Pudong railway (passenger service is currently suspended) and Jinshan railway operated by China Railway, and Line 16 and Line 17 operated by Shanghai Metro. , four additional lines—Chongming line,