The liability issues will make the adoption of the technology difficult, perhaps even impossible. In the 1970s, auto manufacturers hesitated over implementing airbags because of the threat of lawsuits in cases where someone might be injured in spite of the new technology. Over the years, airbags have been endlessly refined. They now account for a variety of passenger sizes and weights and come with detailed warnings about their dangers and limitations. Taking responsibility for every aspect of a moving vehicle, however—from what it sees to what it does—is far more complicated. It could be too much liability for any company to take on.