The PHX Sky Train is a free, 24-hour electric people mover at Phoenix Sky Harbor International Airport. The first segment opened to the public on April 8, 2013. The second segment, extending the train to Terminal 3 (with a walkway to Terminal 2) opened on December 8, 2014 The PHX Sky Train is gradually replacing shuttle buses, which is expected to reduce road congestion, pollution, bus noises, diesel soot, and pitting and buckling of roadways caused by the heavy buses.