Fully fledged self-driving technology appears to be pepetually just around the corner. It is a promise that the Tesla chief executive, Elon Musk, has made almost every year since 2013. But in the real world, it is still an open question whether level five self-driving automation is actually possible. Josh Toussaint-Strauss finds out how close industry frontrunners have come to full automation and assess the scale of the problems standing in their way
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