German automakers won't have to bring their experimental autonomous cars to California for testing anymore. The country has just approved a law allowing companies to test their self-driving cars on its roads, so long as they follow a set of conditions. Perhaps the most important requirement is that drivers must be sitting behind the wheel all the time. They can take their eyes off the road to, say, use their phone and browse the internet, but they need to be able to take over if the vehicle's AI needs them to. In addition, the vehicles need to have a black box to record the journey and log whether it's the AI or the driver that's in charge. The box's logs will determine who's to blame in case of accidents: if it's a human in charge, then the government will hold the driver responsible.