The Infrastructure unit handles transportation, power, and hydroelectric facilities.[88][89] Transportation projects include highways, bridges, rail, and aviation facilities.[89] Bechtel has built more than 17,200 miles (27,700 km) of roadway, 390 power plants, 50 hydroelectric plants,[90] as well as 20 towns and cities globally.[79] It has worked on 300 subway and rail projects, 80 port and harbor projects, and 96 major airport projects.[90][91]