The construction of the expressway was undertaken on February 1, 1968 by our technicians as a project of the Second Five year Economic Plan. The 22.4m wide and four-lane road extends 428km in length, allows 80-120km speed per hour and by which the distance between Seoul and Pusan would be covered in approximately five hours. The expressway which cost a total of 42.97 billion Won in Korean currency will be finally opened to traffic on June 30, 1970. The construction has proceeded under the four divided sections; Seoul-Osan, Osan-Daejon, Daejon-Taegu and Taegu-Pusan. The last section Daejon-Taegu has been encountered with many techically difficult works and all course will be over upon completion of the last section. There will be built 18 inter-changes, 29 bridges(longer than 100 meters) and six tunnels.

The Ministry of Communications issues a commemorative postage stamp in celebration of the official opening of the expressway which symbolizes the achievements of the modernization of the nation.