I was thinking about this the other day and did a Google search on it. France is trying out a technology that is similar to what I'm thinking of. But they did this a long time ago, and from what see, they have abandoned the use of the technology. Variable Lane Freeways is a method in which you have a normal 4 Lane freeway (4 lanes in each direction, although it can be as low as 2 lanes in each direction). You have 4 lanes going in each direction and then you have a center lane (emergency lane). The barrier between the lanes is adjustable. Where I live, Salt Lake City is the center of attention for most people. When people go to work, the freeway is clogged up southbound towards SLC and at night is clogged in the northbound direction. In the morning, southbound will have up to 6 lanes which helps speed the process of getting there. When you have more people traveling on the inside lanes and less on the outside lanes, getting onto the freeway is easier (which is where the weakness is, causing traffic slowdowns). And then at night, the barrier will be moved to the opposite side giving the northbound direction 6 lanes. This is great for countering bad traffic caused by rush hour, construction. Using this concept along with variable speed limits I'm pretty sure most traffic congesting problems will be solved without having to have 8 lane freeways in each direction. The cost to implement this system in the long run will be about the same as building up to 8 lanes, except without using up more land (which isn't always available). What do you guys think?