A free express lane would not shorten drivers trips

The principle  behind these lanes is that just adding a lane or two will not speed  traffic materially because the demand at rush hour is so high.  By using  the tolls based on dynamic pricing, demand on the tolled lane can be  managed down so that some drivers (those who value their time the  highest) can travel at a materially higher speed then the general travel  lanes. Do you see this an an acceptable solution?  Why/why not?
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