Self-driving cars have the potential to be the most transformative force in American cities since the development of the interstate system. And yet when it comes to preparing for the future of autonomous travel, urban planners have been largely idle. Just how idle? As of mid-2013, just one of the 25 largest metropolitan planning organizations in the U.S. had so much as mentioneddriverless cars in its long-term regional plan. This bleak preparatory record comes courtesy of University of Pennsylvania planning scholar Erick Guerra, who reports the findings in the Journal of Planning Education and Research. Federal law requires MPOs to produce regional plans every four years that look at least 20 years out—a horizon that could easily coincide with the mainstream arrival of self-driving cars. But when Guerra combed these plans for signs of autonomous vehicles, he came up virtually empty.