All over the world, it has been found that people have a rather constant time budget for travel. The amount of time seems to depend on how valuable the goal is to them. But for daily commuting, half an hour or an hour is about maximum. So if a new freeway is built, or an existing one is expanded, so that people can now travel twice as far in that hour, they begin looking for a higher-paying job within a larger radius of home. And they begin looking for cheaper or more attractive housing, farther from where they work.
Experience shows that added lanes and new roads fill up rather soon after they are completed.
In fact, they are inevitably the strongest advocates for new road capacity. The bottom line is that the CMP is a fraud. It doesn't manage congestion. Remove the subsidies for driving. Eliminate free parking.