T.T.
I've taken this route MANY times. I haven't looked at a map, but we pick up the Will Rogers turnpike in Oklahoma that pretty much brings you to the state line of Mo. It is a much easier drive than it used to be, they have done a lot of work in Ok that made a huge difference in the driving quality. We go North to Sedalia, so I don't know what it's like between Springfield and St. Louis.