The correct answer to this open question is the following.
The traveling conditions and systems used by Alexander the Great were the following.
Alexander the Great was considered a great explorer as well as an excellent warrior. He traveled by land and by sea. When he traveled by sea, he had a navy official named Nearchus, his naval right-hand. Alexander traveled in ships that had 15 oars.
When travel by land, Alexander took most of his troops with him. What made him a great leader is the way he arranged logistics to support his soldiers. He took with him women and slaves to serve his troops. He demanded every soldier to carry his belongings in a kind of backpack, included food. For other supplies, Alexander used horses to carry them. His logistics in the war were impressive.
Romans used something similar. They were influenced by the feats of Alexander. However, Romans built well-paved roads because they used wagons for transportation purposes. They transported war supplies, medicines, food, and all the logistics needed on the battlefield.
Those roads were so well designed by Roman engineers that today you can visit some of those roads. Romans also traveled by sea using modern ships that resisted heavy weights.