An electric, driverless shuttle bus has taken to Dutch public roads on Thursday, rolling six passengers along a 200m stretch of road in the first trial of its kind worldwide. — in the guardian
And this is not really much, but it is a start, although I think that having self-driving mass transit buses is going to take longer to be accepted by users than private self-driving cars. The main reason being that in the former responsibility for what happens is more diffuse. Who can take over in the case of a problem? In a self-driving car the owner ends up being accountable for what happens.
And there’s also the devil aspect of having mass transit systems being self-driven: dismissing the driver will send thousand of professional drivers to unemployment, while in the private car realm you wont see that impact.