Well its the shorest way on my MS streets and maps application. Waco up through Dallas and then cut back over to 40. If you find a better way thats cool but let us know so we can plan to look for you guys or not. I'm sure there is a way from Waco to Amarillo but I have no idea now many little hwys you will have to cut in and out of. If you need help gimmie a shout and I'll see what I can do for you guys.