I live in Colorado, and thinking about driving in the Rockies brought up a question. How does the car's regenerative breaking deal with typical mountain driving without overheating the breaks? I always downshift my car to utilize engine breaking when decending steep grades when driving in the mountains to prevent the breaks from overheating, and to keep a safe speed. Sometimes, the people that scream down the descents at 80, 90 or faster miles per hour, and hit their breaks over and over again really scare me. With an EV, like the Model S, there doesn't seem to be an option for maintaining ones speed down a steep descent without using the breaks.