Generally, transportation inside Shanghai city is considered both convenient and satisfactory. As an international metropolis with the largest population in China, Shanghai will inevitably face the problem of overpopulation and traffic congestion. However the situation is currently somewhat better than in Beijing. To relieve the transportation pressure, the government has done a lot of work including constructing a large number of roads, subways, and opening more new bus routes. Now, the city has the world's largest public transportation system handling the largest daily volume of passengers.
A high-density road network makes overland transportation easy. Taxis, city buses, and sightseeing buses are ready to bring you to everywhere in Shanghai. If you prefer driving yourself, rental cars are available - a word of caution though - if possible, avoid the congested overhead roads in the urban area inside the Inner Ring Road during rush hour.
Shanghai's five subway lines have connections all over the city, with stops at or nearby the main attractions and commercial areas. If you are just sightseeing and in no hurry, the subway will provide you with fast and comfortable service (though you may want to avoid rush hour of 7:00 to 9:30 and 16:30 to 19:30). Additionally, you may want to check out the speedy maglev train which runs between Longyang Road and Pudong Airport.
Nanpu Bridge, Yangpu Bridge, Xupu Bridge, Lupu Bridge and various tunnels across the Huangpu River provide direct links between Pudong New District and Puxi Area. Ferries offer convenient shuttle service across the Huangpu River, allowing you to avoid the crowded bridges and tunnels while appreciating the river scenery. Additionally ferryboats are available between the mainland of Shanghai and its three islands of Chongming, Changqing and Hengsha.