Is Hong Kong transport sustainable?

Different transportation systems produce different types of cities and therefore places and spaces within them. The forms of modern cities are therefore subject to modes of movement and transportation, namely, walking, mass transit, and personal automobiles. Walking cities are usually associated with European towns, which gained their vitality from their compactness of the dense city centres. In these cities pedestrians come first. Most of them have also high quality and integrated public transport. The compact nature of Hong Kong's urban form may be compared with the form of the European medieval city. But instead of being compacted by walls Hong Kong is compacted by its topography: the sea and the unstable hills. As a result, Hong Kong has become a great example of a compact city, one of the very few in the world. The Hong Kong transport system works extremely well. It is probably the only public transport system in the world that makes a profit. But is Hong Kong transport sustainable?