

Sure an extra lane can relieve congestion, for a bit then 10 years later you’re back to where you started or worse.
This is mostly due to the fact that American cities grow sprawl and not density. So basically unless there’s a population collapse adding another lane is a temporary solution.
That’s why they are basically always adding new lanes, they can’t keep up with the demand. So instead of continually trying to keep up with demand it’s time to work on reducing demand
Seems a bit pedantic, but sure.
New roads are unlikely to fix issues in many places. Small to medium sized town building a new connector would be helpful. Not so helpful for anything large or metro sprawl. Those places mostly limit themselves to adding additional lanes with little result