thanks chiple hmm. so what can be the solution to these problems? here is my motivation for this question: i) an excellent road network is essential for the movement of goods and for the movement of people. i think transportation should be the TOP physical insfrastructure priority in our case. i admire america for its highway system. i really feel jeolous about that. ii) although our terrain is uncommon, surely it is not unique? there must be other places in the world where they surmount the very same problems we have. what are their solutions? how do they traverse the hills? even if we are unique, is it possible to envision any solution. surely, the world has made great technological strides that maybe we can adapt and benefit in our country? iii) what about the plains? it seems like there is a lot to be done there too, especially since the returns to building roads are probably going to be higher from that region. what has held us back so far? i mean to ask this question on the technical side, apart from the usual corruption et al. thank you for your precious ideas, thoughts...whatever