Driverless cars don&#x27;t have to be custom-built: you can add a kit to an existing car that contains a Linux box, LIDAR, cameras, and appropriate machinery to drive the car&#x27;s controls.  Most of the existing Google prototypes have been Priuses or Lexuses with the kit.  IIRC, all the components are pretty inexpensive; by far the biggest cost is the LIDAR, but that&#x27;s because they&#x27;re not produced in volume and so you have to pay custom-built prices.