streets in Bogotá that are already damaged, and this makes Bogotá a city where is hard to drive without traffic and without accidents. Start a civil work that can alter for the worst the city is not a good thing to have in mind even though not all the streets are damaged.
Jorge Puerto (n.d) also says that having the underground metro needs very well studies of the floor. There are either clayey floors on the north and the west of the city, but there is also a well solid structure in Carrera Séptima. This is the main reason to do a good investigation to know the best choice depending on the place.
Basically, in a city that was not so well constructed like Bogotá the good thing to do is a good deep investigation on the places the metro lines are supposed to be in the future. There are risks for the underground metro and the elevated, so what we can see is the right thing to do is analyze the floors to came up with a way a metro can be finally installed as long as it is well planned and it do not be a weird-improvised mix that ends up even worst for the citizens. This could explain why there is no metro yet because Bogotá is a city where is not easy to build civil works that complex, so it is hard to get a solution easily knowing that both systems of the metro have depending consequences.