Thailand's expressway system comprises (usually elevated) high-capacity controlled-access highways serving the Greater Bangkok area and some nearby provinces. The system is operated under the oversight of the Expressway Authority of Thailand (EXAT), and is distinct from the Thai motorway network. First opened to service in 1981, the system currently consists of seven completed sub-systems completed adding up to a total distance of 198.4 kilometres (123.3 mi).
The constituent expressway systems are (in order of completion): [1]