In 2009, the government announced an economic stimulus program to revitalize the economy and help low-income people. One of its key components focused on infrastructure investment on four-lane highway expansion. Thus, the GMS Highway Expansion Project was formulated to upgrade 178 kilometers (km) of two-lane national highways to four-lane highway standard, including National Highway (NH) 12 from Phitsanulok to Lom Sak (105 km) along the East–West Economic Corridor (EWEC), and NH 359 from Phanom Sarakham to Sa Kaeo (73 km) along the Southern Economic Corridor (SEC).
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