(Bloomberg) – It only took a few hours for the first self-driving taxi shuttling people around Las Vegas to collide with a vehicle being driven by a human doing something it didn't expect.

The driverless passenger van was on its first day Wednesday of offering free rides to people along a half-mile loop in Las Vegas, part of a pilot program to study the technology. It was dinged by a tractor-trailer as the truck attempted to back into an alley to make a delivery.

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