Self-driving cars showcased at Detroit Auto Show

Some of them are already being tested, delivering pizzas, groceries, and people to their destinations.

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    Many car companies around the world are tightening their operations.

    They're doing it for one reason: they know their industry is changing and changing fast.

    Technology is redesigning cars at every level, from how they are made, to how they are driven. Driver-less vehicles are at the forefront of those changes.

    Al Jazeera's John Hendren reports from the Detroit Auto Show.


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