Phahonyothin Road
When the railway is finished. Later, many roads were built in Saraburi, such as Nong Don - Phra Phutthabat Road and Pichai Ronarongsongkram Road from Saraburi City to Sao Hai District built in 1928 - 1933. For other roads, in 1937 - 1939, Phahonyothin Road was built from Bangkok to Saraburi. In 1955 - 1958, Mittraphap Road was built from Saraburi to Nong Khai.