The path to fully autonomous vehicles is lined with many milestones, and each comes with its own set of challenges. As Tesla, under the watchful and ambitious eye of Elon Musk, traverses this path, it continues to hit and surmount these milestones. However, the final destination — a world where cars are completely autonomous, able to navigate the complexities of human-built environments without any human input — still lies in the future. How far into the future is anyone's guess. But with every passing day, as Tesla's Full Self-Driving System evolves and improves, that future gets a little bit closer.