You can see at least three different radius of curvature. One is very near to us, the other is in the middle and the 3rd one is beyond that. I am talking about the middle curve, it is not only very sharp, but is also without a SUPERELEVATION. The outer line should be a little higher than the inner line. This is absent here.
See the photograph below to know about it. It is the difference between two elevations of a road or a railway, and the photo below shows it perfectly. One edge is elevated comparing to other edge. Why super elevation? It is because the train will derail because of centrifugal force without a properly calculated super elevation,
e. I also do not like the look of the entire route. Looks very poor.
Vietnam should have sought help from Japan as Indonesia did. The Japanese are very meticulous. Engineers would always do works perfectly.