Comment by inglor_cz

Public transit would also benefit from self-driving, as bus drivers and their salaries are a major limiting factor to how many lines you can run.

Bus drivers are a limited and very moveable workforce, and if you have huge economic differences in your common market, poorer cities won't find enough drivers to sustain their own systems.

An example: there is helluva lot Bulgarian and Romanian drivers in Western Europe, and there is no way that Sofia or Bucharest, cities with half the GDP per capita, can afford to pay them competitive salaries.