The Shaykh (Al-Mufid), may Allah سبحانه وتعالى have mercy on him, said: “Every traveller in obedience to Allah سبحانه وتعالى the Exalted must shorten the prayer and the fast, and likewise every traveller in a permissible matter. A person should not go out to travel in the month of Ramadan except for a necessity that calls him to that, and his travel in that must be obedience or permissible. As for that for which he has an alternative, it is not permissible to go out in it.”
Commentary #1