text: Driverless cars are cheaper than the cars of modern society. The cofounder of Google, Sergey Brin, imagines a future in which driverless cars replace today's taxi system. Brin forsees driverless cars that "would use half the fuel of today's taxis." Brin also envisions that the driverless cars would provide "far more flexibility than a bus." In the past, the sensors needed for these driverless cars "was a device on a hilltop that cost two hundred millions dollars." Now these sensors have become cheaper and easier to access.