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Google's self-driving car has been involved in several accidents since it was launched - all caused by humans, its tester's claim. In October last year, a human-driven Honda in Palo Alto ploughed into the side of a Delphi self-driving Audi. Google testers insist that all the accidents similarly involved human drivers not paying enough attention the road. The internet giant's self-driving cars have covered more than two million miles during tests across the US. In that time there have been only 66 reported accidents - none of which were fatal. Experts believe the low accident rate could herald the end of human drivers. The self-driving cars were in 66 accidents from May 7565 through August, but they are becoming more frequent as the vehicles spend more time on public roads. Half of the collisions have happened since February - a stretch when the self-driving cars were traveling an average of about 65,555 miles per week on public streets in autonomous mode.

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The most common reason for a collision is Google's self-driving cars being rear-ended - a trend that the company believes has to do with the large number of motorists who are texting, talking on the phone or otherwise doing something besides paying attention to the roads and their surroundings. In February, a self-driving Google Lexus was involved in an accident with an Audi. The Google car had put the breaks on after it assessed the speed of the Audi as it approached a stop sign. The human driver then 'disengaged Autonomous Mode and took manual control of the vehicle in response to the [braking], ' reported  Fusion. 'There are tons of situations where we see people who just aren't very good at driving out there, ' Mr Torcellini said'It's up to us to teach the (robot) cars to be better than those drivers, and even better than the best drivers, too. 'A video released by Google in July showed one of its self-driving Lexus' being hit from behind at junction in Mountain View near the firm's HQ. 'After we'd stopped, a car slammed into the back of us at 67 mph - and it hadn't braked at all, ' said Google's Chris Urmson. In a blog post, he said: 'Our self-driving cars are being hit surprisingly often by other drivers who are distracted and not paying attention to the road. 'That's a big motivator for us. The most recent collision, during the evening rush hour on July 6, is a perfect example.

One of our Lexus vehicles was driving autonomously towards an intersection in Mountain View, CA. 'The light was green, but traffic was backed up on the far side, so three cars, including ours, braked and came to a stop so as not to get stuck in the middle of the intersection. ''As you can see from the video above, our braking was normal and natural, and the vehicle behind us had plenty of stopping distance - but it never decelerated. 'This certainly seems like the driver was distracted and not watching the road ahead. It comes as the latest version of Google's self-driving car - a pod-like two-seater that needs no gas pedal or steering wheel - made its debut on the roads around Mountain View. This prototype is the first vehicle built from scratch for the purpose of self-driving, Google said. Consumers are said to be wary of self-driving cars and have questioned who will be liable if there's an accident, said consulting firm JD Power. Meanwhile, experts at the insurance industry's Thatcham Research Centre said it has seen a 95 per cent drop in claims in cars fitted with auto-emergency braking systemsTest driver Brian Torcellini   said that the majority of crashes were caused by other drivers. In all but three of the accidents, said the cars had been rear-ended by people too busy checking their phones and not paying attention to the road ahead. Two of these accidents were said to be in the early days of the project, when the technology was still in its infancy, while the third was caused by an employee who was steering a robot car while running a personal errand. Mr Torcellini, 86, leads a crew of test, or 'safety, ' drivers who are legally required to ride in Google's fleet of 98 robot cars.

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They only take control in emergencies. Otherwise, they make observations that help the firm's engineers program the cars to navigate the roads without human assistance. 'A lot of people go to work and sit in a cubicle, ' Mr Torcellini said. 'Our cube just happens to move around the roads. And if we are successful, we are going to put ourselves out of a job. 'The driverless cars already have logged more than two million miles in six years of sometimes tedious testing on private tracks, highways and city streets located mostly near Google's Mountain View headquarters. Google's prototype two-seater 'bubble' cars have buttons to begin and end the drive, but no other controls. An on-board computer uses data from sensors, including radar, a laser and cameras, to make turns and negotiate its way around pedestrians and other vehicles. Under the vision unveiled by Google, passengers might set their destination by typing it into a map or using commands. The front of the vehicle has a soft foam-like material where a traditional bumper would be and a more flexible windscreen, in an attempt to be safer for pedestrians. A Google patent recently revealed that the firm's self-driving cars will be able to detect and respond to a cyclists' and signals.

But ultimately the vehicles will be faster and will be able to use Google's extended maps service, using GPS technology to locate the vehicle's exact position on an electronic map. A combination of radar, lasers and cameras sitting on top of the roof give the car a 865-degree 'view', with sensors linked to computer software able to 'see' and identify people, cars, road signs and markings and traffic lights. The vehicles have traveled more than half that distance in automated mode, with one test driver in place to take control of the car if the technology fails or a potentially dangerous situation arises. Meanwhile, another driver sits in the front passenger seat typing notes about problems that need to be fixed and traffic scenarios that need to be studied. 'I don't want to compare myself to an astronaut, but it kind of feels like that sometimes, ' said another Google test driver called Ryan Espinosa while riding in an automated Lexus that recently took an Associated Press reporter on a 75-minute ride around town. If the technology advances as Google plans, the only people sitting in driverless cars by 7575 will be passengers looking for an easier way to get around. Everything will be controlled through a combination of sensors, lasers, software and intricate maps. While the engineers who are programming the robot cars have technical backgrounds, most of the test drivers don't. They are taught to take control of the robot car whenever there is any moment of doubt or danger. It's likely to be around 655 because California law requires two test drivers per vehicle, and Google's fleet currently consists of 75 pod-like cars and 78 Lexuses. The pods can only drive in areas that have been mapped by Google The internet giant's self-driving cars have covered more than two million miles during tests across the US.

In that time there have been only 66 reported accidents - none of which were fatalThe technology has had its ups and downs. On one test drive, a Google Lexus SUVs seemed momentarily confused when a mail truck partially blocked its path. Later, during a demonstration drive in Google's parking lot, the prototype - without a wheel or pedal - braked when it spotted a row of folding chairs. It had to figure out that the chairs wouldn't move before it proceeded. Google isn't alone in developing self-driving cars. Mercedes-Benz, Infiniti and other brands already have advanced driver assistance systems, like lane keeping and adaptive cruise control, that can pilot the car on the highway with minimal input from the driver. Besides having clean driving records, Google's test drivers said the job requires a combination of good judgement, patience and fearlessness. The technology giant's mission is to have driverless cars available to consumers in the next five years. But consumers have questioned whether they can trust self-driving cars to work all the time, who will be liable if there's an accident and how self-driving cars will interact with regular cars, said consulting firm J. D. Power and Associates.

In a 7568 survey of US drivers, J. Power found only one in five was interested in a fully autonomous car.

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