Mittraphap Road

National Highway 2
National Highway 2
ทางหลวงแผ่นดินหมายเลข 2
ถนนมิตรภาพ Thanon Mittraphap; "Friendship Highway"
Route information
	Part of AH12
Length	509.113 km (316.348 mi)
Existed	1957–present
Major junctions
Southwest end	Saraburi, Phahonyothin Rd.
Northeast end	Nong Khai, Thai–Lao Friendship Bridge Laos
Location
Country	Thailand
Provinces	Saraburi, Nakhon Ratchasima; Khon Kaen; Udon Thani, Nong Khai
Highway system
	Highways in Thailand; Motorways; Asian Highways;

Mittraphap Road (Thai: ถนนมิตรภาพ, Thanon Mittraphap) or Thailand Route 2 (Thai: ทางหลวงแผ่นดินหมายเลข 2, Thang Luang Phaen Din Mai Lek 2) is one of the four major highways in Thailand, along with Phahonyothin Road (Route 1), Sukhumvit Road (Route 3), and Phetkasem Road (Route 4). It runs from Saraburi to Nong Khai. It was built with financial assistance from the United States of America.

It is the first highway in Thailand to meet international standards, and the first highway in Thailand to use both asphalt and concrete. It received the name "Thanon Mittraphap" on February 20, 1957. The name literally means "Friendship Road". It is the main road that connects Isan (northeastern Thailand) across the Dong Phaya Yen Range. The Highway begins at Saraburi, Phahonyothin Road (Route 1) junction. It passes through the provinces of Nakhon Ratchasima, Khon Kaen, Udon Thani, and ends in Nong Khai, where it links with the Thai-Lao Friendship Bridge to Laos.