None were more widely reported on than the first known fatal accident between a self-driving car and a pedestrian in Arizona earlier in the year.

There are a lot of hurdles to clear before autonomous cars can fully take over the roadways. Chief among them is training the police on how to react and handle a self-driving car error, as spotted by Recode. Currently, Waymo is working with local police forces and first responders in Arizona, California, Texas and Washington to educate them on how to identify and access an autonomous car in the event of an accident. Furthermore, if there isn't a driver present, the car will find a safe place to stop if a collision happens or if there's a system error. Same goes for times when its sensors are essentially whited out during a snow storm or other inclement weather.

Reuters reported Tuesday that Germany's Transport Minister Alexander Dobrindt plans legislation requiring self-driving cars be outfitted with data-recording systems in an effort to bring more accountability and to give automakers and engineers a chance to learn from the systems' mistakes. The proposal would enable autonomous car users to divert some of their attention from traffic while the systems are on as long as they are seated at the wheel but require that they maintain black boxes that track when the programs request drivers take over.