We go straight through on 40 but be alert to required lane changes to not go to I24, 440 and I65. It can be a mess during rush hour. I tell my wife to also be alert for need to change lanes as we go through. GPS is watched closely as well. If you are not familiar with Nashville, I suggest you look at Google Earth for their street view and aerial photos before you get to Nashville. That's what I did to get through Mobile, Alabama from Hwy 45 to east I 10 to Pensacola. You could take 840 around to the south of Nashville for a nice country drive but much longer.