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PITTSBURGH (AP) - Uber riders in Pittsburgh can get a glimpse of the future by summoning a car capable of handling most of the tasks of driving on its own.On Wednesday, a fleet of self-driving Ford Fusions began picking up Uber riders who opted to participate in a test program. While the vehicles are loaded with features that allow them to navigate on their own, an Uberengineer sits in the driver's seat and can seize control if things go awry.Uber's test program is the latest move in an increasingly heated race between tech companies in Silicon Valley and traditional automakers to perfect fully driverless cars for regular people. Competitors such as Nissan and Google have invested hundreds of millions of dollars and logged millions of miles test-driving autonomous vehicles, but Uber is the first company in the U.S. to make self-driving cars available to the general public."That pilot really pushes the ball forward for us," said Raffi Krikorian, Director of Uber Advanced Technologies Center (ATC) in Pittsburgh, the company's main facility for testing self-driving vehicles. "We think it can help with congestion, we think it can make transportation cheaper and more accessible for the vast majority of people."Removing the cost of the driver is one way to make rides more affordable. But that prospect didn't sit well with some Uber customers."It scares me not to have a driver there with an Uber," said Claudia Tyler, a health executive standing near the entrance of an office in downtown Pittsburgh.Channel 11 News anchor Lisa Sylvester tried out the service Wednesday. For the most part, the ride went smoothly, but the human driver had to intervene twice. In the first instance, the car came to a stop instead of switching lanes when it encountered a double parked car in the road. In the second instance, a driver veered in the Uber car’s lane and got a little too close, resulting in the automated driving being suspended.Approaches to driverless technology differ. Google, a unit of Alphabet, and Ford Motor Co. want to perfect the fully driverless car — no steering wheel, no pedals — before letting the public climb in for a ride. Others are adding autonomous features in phases, while relying on the driver to take over in certain circumstances.Many experts predict that it will be years, if not decades, before the public is being driven around in fleets of fully driverless vehicles under any condition."Because vehicles are driving at seventy miles per hour on the highway, if something goes wrong, things could go wrong very bad, very quickly," said Carnegie Mellon engineering Professor Raj Rajkumar. "This technology needs to be ultra-reliable before we can take the human out of the driving equation."NuTonomy, a spinoff from the Massachusetts Institute of Technology, got the jump on Uber globally three weeks ago when it began picking up passengers in self-driving taxis in Singapore. The company said Tuesday that its six taxis — with backup drivers — haven't had any accidents since the service launched.The Uber vehicles are equipped with everything from seven traffic-light detecting cameras to a radar system that detects different weather conditions to 20 spinning lasers that generates a continuous, 360 degree 3-D map of the surrounding environment.During the demonstration for reporters two engineers were seated in front — the backup driver and another monitoring the car's 3D map and scribbling notes on how to improve the car's software. The engineers must undergo a week of safety orientation or more to drive the cars, with additional training as the vehicles continue to be refined.Pittsburgh is a particularly good place to experiment, they said, because the city is a research hub for self-driving cars and has notoriously bad driving conditions, including snowstorms, rolling hills and a tangled network of aging roads and bridges. Uber executives are watching to see how the cars handle these challenges before saying when fully driverless vehicles will be ready to hit the roads."We actually think of Pittsburgh as the double black diamond of driving," Krikorian said. "If we can really tackle Pittsburgh, that we have a better chance of tackling most other cities around the world."Bill Peduto, the mayor of Pittsburgh, lobbied the Pennsylvania state government to allow ride sharing in the city."Lots of people think steel built Pittsburgh. It was innovation," Peduto said. "Regulations rarely if ever come before innovation, and if you try to put regulations first, all you do is guarantee innovation will occur somewhere else."Uber officials hope the initial trial will teach them how to ease public fears of adopting the leading-edge technology."The Pittsburgh pilot is our opportunity for real world testing, so that we can learn more about what makes riders feel safe and comfortable," said Uber product manager Emily Bartel.Uber's Silicon Valley roots means it tends to pivot quickly and plan, experiment, and adjust direction within weeks, in contrast to longtime carmakers like General Motors or Toyota who have years-long timelines when bringing out new features, Rajkumar and Uber officials said. When the drivers are removed from front seats, the cars will likely be restricted to driving in specific locations under good conditions at first.___Channel 11 News and Dee-Ann Durbin in Detroit contributed to this report.