A car drove into one of the pedestrian subways at Elephant & Castle on Tuesday evening and overturned.
The incident happened at about 8pm outside the London College of Communication.
Police, fire and ambulance crews all rushed to the scene.
A similar crash occurred at the nearby southern junction in 2007.
In 2010 another of the now-closed subways at the southern junction was filled with gravel when a lorry ploughed through the barriers.