Mountain View, California - Google's self-driving cars are mastering complex situations on public roads, from cars going the wrong way to bicycles darting in front of traffic, as it strives to win the high-profile race to achieve full vehicle automation.
The company, which has been developing autonomous cars since 2009, said its self-driving vehicles had logged 3.2 million kilometres on public roads, and it continues to log about 48 000km of test drives per week.
Google has been a leader in testing autonomous vehicles on public roads, prompting traditional carmakers to step up their self-driving plans to avoid being eclipsed by the tech leader, which has yet to disclose a business strategy for its car project.
It has focused on making cars fully autonomous, with no need for a driver, which could make driving safer and more efficient and open up transportation to the disabled and aged. Google said in 2015 such cars would be ready for production by 2020.
This approach stands in sharp contrast to many carmakers, including Toyota and Tesla, which are moving towards autonomous driving in incremental steps, currently still requiring drivers.