Anita Rani and Justin Rowlatt embark on two epic car journeys through China, navigating congested cities and winding mountain roads to explore whether the country’s economic growth, exemplified by its booming car industry, can be sustained. If so, what impact would that have on the world and on the day-to-day lives of the Chinese people? In the first of the two-part series, the pair set off from Beijing and take two very different routes towards Shanghai - journeys which will take three weeks to complete.