In an ambitious experiment, a fleet of cars laden with lasers, cameras and other sensors -- but with no one's hands on the wheel -- were to be deployed by the web-based ride service on the challenging roads of Pittsburgh, Pennsylvania, steering themselves to pick up regular Uber passengers who are used to being fetched by cars driven by humans.
Four of the Ford Fusion hybrids with their ungainly rooftop load of technology will be deployed to a select customers today, with the company showing at least a dozen more ready to put on the streets.
The cars and their backing technology have been trained on the city's complicated grid for less than two years, but demonstration rides ahead of the launch showed them very able to handle most situations -- as able as many drivers.
Still, just to be sure, the Pittsburgh Uber regulars who summon a driverless car will also get two company technicians with them to make sure everything goes right.
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One will sit behind the wheel, with hands at the ready to take over in sticky spots, while the other monitors the car's behaviour.
The goal, Uber officials say, is to get to zero interventions, and no technician along for the ride.
The move has put Uber ahead of the rest of the auto industry in getting such cars out for the general public. The major automakers all have driverless car development programs, as do tech giants Google and Apple. And many automakers already have cars on the road with advanced driver assist technology, most notably Tesla.
But the Singapore experiment is so far limited to a smallish area on the very flat, well-planned Southeast Asia island. Uber's landscape is the whole of Pittsburgh, a major US city with very steep hills, old narrow streets and multiple bridges and highways built through the middle.
What allowed Uber to get to the front of the pack was not auto engineering but rather its ability to accumulate and crunch massive amounts of data on road and driving conditions collected from the billions of miles driven by Uber drivers.