On some of the interstates there is a dedicated toll lane in both the north and southbound sides (I-85 northeast of I-285 as one example). So, those lanes are rarely closed, unless there is construction or an accident.
On other interstates, there is a single toll lane that is reversible. It flows one direction for the morning rush, and the opposite direction for the evening rush. I-75/I-575 northwest of I-285 is an example). If you are traveling the opposite direction of the flow of the toll lane, then the signs will say closed.
Yes, I enjoy racing - mostly NASCAR, but I also enjoy watching F1 on occasion. My profile pic is from a Richard Petty Driving experience at the NASCAR track that used to be at the edge of the MK parking lots. It was very cool to drive the car so fast around a professional track! The hans device is an amazing safety invention. Very cool to know the person who invented it!