Martínez and collaborators used real trip data to model what life would be like in Lisbon, Portugal, if shared autonomous vehicles of various size ruled the streets. Some scenarios had these taxibots partnering with high-capacity public transit—in Lisbon’s case, a subway network—while others considered a transit-less city. (Though taxibots replaced local buses in all cases.) At half a million city and 2.8 million metro area residents, Lisbon is a pretty typical midsized city, though it’s car-ownership rate (217 per 1,000 people) is on the lower end of the global scale.