The road begins at Ban Mi District, Lopburi Province and ends at Mueang Nakhon Ratchasima District, Nakhon Ratchasima Province.

It is a strategic inter-regional road, linking the Lopburi military base in central Thailand to Nakhon Ratchasima.

The road was built in 1943, during Prime Minister Field marshal Plaek Phibunsongkhram's tenure, but was not completed until 1951.

Part of the road was built on abandoned railway track, with several railway bridges being converted into road bridges.

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