In this 30-year period, there was an important change in the planning philosophy of the country, but road transport maintained its primary role. At the beginning of this period, Thailand introduced, for the first time, international planning concepts to the kingdom through the implementation of the 1st National Economic and Social Development plan (1962-1966), the “big plan” period according to ADB (1989). And, like many developing countries in the region, the 1st – 3rd (1962-1976) Plans emphasized the acceleration of economic growth and basic road infrastructure development without much consideration of land-use, converting Bangkok into an automobile city (Bongsadadt, 1987).