How much is it? I-66 tolls start Dec. 4 inside Beltway

Any driver riding alone during the restricted times, including traffic to or from Dulles International Airport and hybrid vehicles, must pay an automated toll that rises and falls based on traffic in the lanes.
“It’s dynamically priced … basically that’s an algorithm that measures congestion, and as the congestion increases the toll increases, and as the congestion goes down, the toll decreases,” VDOT Tolling Division Administrator David Caudill said…
The goal is to keep traffic between the Beltway and U.S. 29 in Rosslyn moving at least 45 mph.