This doesn't mean you'll see fleets of robotic trucks in the near future. Daimler had to get permission for this run, and the law (whether European or otherwise) still isn't equipped to permit regular autonomous driving of any sort, let alone for giant cargo haulers.
Still, this could make a better case for approving some form of self-driving transportation. Even though there's still plenty of work left before this tech can handle any situation, it's good enough that it can be trusted in run-of-the-mill vehicles at high speeds. (engadget)