The working day has just ended and all hell has broken loose in the Beijing district of Sanlitun.Half of the Chinese capital’s population seems to be out and about, and the shopping and entertainment district is buzzing.The pavements are packed, as are the cycle lanes. On the road, cars and buses idle while the traffic lights are red. When they go green, everyone surges forward at once, creating utter chaos.Despite the mayhem, Bernd Woltermann sits completely relaxed in his Mercedes CLA, unfazed by the hustle and bustle.The Mercedes CLA can navigate busy streets, saving drivers from the stress of heavy traffic. Photo: Mercedes-Benz AG/dpaHe is a passenger in his own car; as soon as he has activated the sat-nav and instructed the car to take over, the electronics guide him through the city maze.