I saw the HOV lane. I went through Atlanta on the way back! It was Sunday around 7:30 PM when I was finishing the I-75 portion prior to heading west on I-20. I didn't bother going in it since I was traversing Atlanta, but you are damn right. I noticed multiple times how it just changes to a one lane road. It definitely required a lot of focus as I got the end of I-75, but I loved it. Seeing a massive Delta Boeing 777 takeoff over I-75, and seeing the city all lit up was awesome!
There were signs that that I-285 East was jammed up due to an accident so I didn't even risk going west on it for people curious of the accident. So I am happy I stayed with I-75!