CDOT has explained before: it can only open the Mountain Express Lanes for a certain number of days per year, because they're technically not highway lanes.
Instead, Hoover said, they are "peak period shoulder lanes." The federal government said the eastbound lane can only be open 100 days a year, and the westbound lane can only be open 125 days a year.
That is the worst part of these "lanes". They really are never open. They "could" be open 100 to 125 days per year, but I suggest it is less in reality. Many, many times traffic has been backed up in the GP lanes just to have the so-called peak period lanes closed. What a waste of taxpayer dollars-two construction seasons of work for basically zero benefit.