The experience on the infrastructure projects in the developing country will give us the enormous information so as to make a policy on the technical assistance for the other developing country, as well as in the developed country.
From the said view point, this paper firstly briefed the history on the development of land transport networks and evidenced the role of foreign assistance which performed on the land transport development in Thailand from late 19 century, which is the one of most successful developing country in the world and has received a great amount of assistance.
On the second part, the economical impact of the national highway development on the agriculture production was measured by applying the imputed value added model to the case of route 2 and 24 which have been developed with the foreign assistance such as USAID and connected the Northeast region to Bangkok. Also, the damages on the forest coursed by the highway development and regional development was analyzed as the case of one of disadvantage of land transport development.
Finally, the problem on the transport project appraisal and the way of its assistance was discussed.