Why a driverless taxi firm had to apologise for noise

A number of Waymo taxis have been driving down a cul-de-sac in east London.

A driverless taxi company has apologised after one of its cars repeatedly reversed out of an east London cul-de-sac in the early hours, making a loud noise.

What does this noise sound like? And does it give us an insight into what London with driverless cabs might look (and sound) like? Ross Ryan has more.