Hong Kong is a special administrative region located on the southeast coast of China with a population of over 7 million people. It has a very mountainous terrain, with less than 25% of the land developed. Due to its limited land resources, Hong Kong has invested heavily in public transportation infrastructure like the MTR subway system and an extensive bus network to help reduce traffic and support its dense population. The MTR in particular is renowned for its safety, reliability, and efficient operations, serving millions of passengers daily across nine rail lines. Hong Kong has also implemented land use and urban planning policies to encourage walking and sustainable development.