During such a time, the connection between cities was done primarily through armoured railway. The immediate vicinities of the railways were considered 'safe', but the other places were still dangerous areas. As for the driving one's self around the world, not even children of clans from the assassin would, such as Emily's clan, experienced such a thing.
Hundreds of years ago, it was said that those within human society, anyone could travel the world as one pleased and feel its boundless nature. Now, this was too extravagant a proposal for most people.
This was the endlessly wide wilderness. The largest space within the cities were their streets, which were just ten meters wide. When compared with their current area, it was easy to see how much wider their field of view became. As they were exposed to this, their minds suddenly seemed to have broadened.