Except it appears that they are taking one of the free lanes away in each direction from route 50 out.
The real bottleneck is inside the beltway where there are just two lanes and they have a separate project to turn that into HOT lanes completely at rush hour which will make them tons and tons of money: http://inside.transform66.org Right now those are two HOV lanes and before the big increase in HOV fines you would see a ton of mercedes-driving lobbyists paying the small fine as a sort of toll. The regulars would get caught all the time and pay the fine all the time. McAwful and others realized that this would be a great source of regular income for someone and that someone will probably be a friend of McAwful. The eventual HOT lanes inside the beltway may not be too crowded but the tolls will be huge. Federal taxpayers will pay some of those tolls via some sort of rebate for the elite federal workers.