We came through Memphis last Sunday, we stayed on I-55, we were heading for Louisiana from Indiana. We came through Sunday morning about 7:30 local time and traffic was Nill. However, it’s 4 lane on each side in places, which makes me think on a work day, during prime hours, it must be a nightmare driving through there. Even with our Tom Tom, we still missed one spot where I-55 viewed right and we kept going straight, and we had virtually no traffic to deal with, and we still missed it. So just keep your eyes open and don’t get to talking and rubber necking site seeing when driving through and you’ll be fine.
I don’t know about the other routes.