Traveling within the state of Texas by car is legal, but marijuana of any kind is still federally illegal, so you can’t safely cross state lines. Also, because of federal regulations, flying in an airplane can be problematic.
In addition, driving under the influence of any substance that affects your mental or physical faculties is a crime in any state, categorized as Driving While Intoxicated (DWI), so consuming medical marijuana while driving is also illegal.