The US Department of Transportation has released its latest set of voluntary guidelines for automated driving systems, a report that builds on previous versions released over the past two years. With Preparing for the Future of Transportation: Automated Vehicles 3.0, the DOT outlines additional safety principles, updates policy and offers guidance to state and local governments. "The integration of automation across our transportation system has the potential to increase productivity and facilitate freight movement," said DOT Secretary Elaine Chao. "But most importantly, automation has the potential to impact safety significantly -- by reducing crashes caused by human error, including crashes involving impaired or distracted drivers, and saving lives. The report notes that it's meant to be an update to, but not a replacement of, last year's guidance, and it encourages those developing automated driving systems to make public their Voluntary Safety Self-Assessments, which were introduced in last year's report.