It consists of multiple sections, including a controlled-access toll road, and almost forms a complete loop around the Bangkok Metropolitan Area.

[1] Due to the rapid economic development of Bangkok which resulted in a significant increase in road traffic, the Bangkok Outer Ring Road was conceived in 1978 as a bypass route to connect the major highways leading out of the capital city.

This section was later extended to Bang Pa-in district, Phra Nakhon Si Ayutthaya in 1995.

This was expanded to 6-8 road lanes in 2010 to handle the increased traffic after the opening of Suvarnabhumi Airport.

It opened for trial use on 15 November 2007 and toll collection between Bang Phli - Suk Sawat began on 23 March 2009.