Unless I'm missing it, I don't see 77. But, I've taken the 285 on the east and west side before. I've never been caught in super major traffic but have heard nightmare's. And, I don't drive at night, generally the 10-3 PM timeframe.
In a car, I recall taking 75/85 thru Atlanta and was surprised that it wasn't as bad as I expected.
Safe travels,
MM.