Central–Mid-levels escalators in Hong Kong is the longest outdoor covered escalator system in the world. The entire system covers over 800 metres (nearly a KM) in distance and elevates over 135 metres from bottom to top. It was constructed in 1993 to provide a better commute by linking areas within the Central and Western District on Hong Kong Island. The total travel time is twenty minutes, but most people walk while the escalator moves to shorten their trip. Due to the geographical situation, the same distance is equivalent to several miles of zigzagging roads if travelling by car. It consists of twenty escalators and three moving side-walks. According to Guinness World Records, these escalators together form the longest outdoor covered escalator system.