This isn’t what Georgia needs. I-10 and I-20 already cover the east-west traffic adequately. What Georgia needs is a freeway from I-75 going southwest to I-10 so Interstate traffic doesn’t have to go all the way east to Jacksonville. Look at the map.
Starting where? Interstate 16 already does what you propose, I believe.
There is one. I85 to I65 takes you from I75 in Atlanta to I10 at Mobile.
What Georgia needs are bypasses from I85 to I75 well east and west of Atlanta to take the north-south traffic out of Atlanta.