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Tetsuya Lijima from Nissan giving a demonstration around the roads of east London of a prototype Nissan Leaf driverless car. (Photo by Philip Toscano/PA Images via Getty Images)

While designers of autonomous vehicles (AVs) continue their quest to make them safer, the realities of complex roadways call for complex ethical decisions about who lives or dies. To address the technological version of what’s known as the age-old “trolley problem,” a worldwide study asked questions such as: if one or more pedestrian is suddenly crossing the road, should the AV be programmed to swerve and risk going off the road with its passengers or hit the people head-on?

Most respondents objectively lean toward protecting the greatest number of people, but also show a reluctance to ride in an AV that doesn’t guarantee protection for its passengers as priority number one.

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