Source: plan the development of the highway network through for Thailand. 2540 (1997), Department of highwaysFigure 2.1.1-2 network special during the city highway, according to the Cabinet resolution 2540 (1997)
Source : Master Plan developed highway network toll for Thailand in May . prof . 2540, Department of Highways Figure 2.1.1 - 2 motorway network between the cities by the Cabinet last year . prof . 2540.
Source: Ministry of development of highway network toll for the year, the Department of highway 2540 figure 2.1.1-2 motorway network between the cities by the cabinet. Year 2540 .