This article analyses mobility in Bogota. It studies the generation of negative externalities of Collective Public Transportation towards other means of substitute alternative transportation such as the Transmilenio Transportation System. Using the 2011 mobility survey, origin-destination matrixes are built while exploring the efficiency in displacements by travel times within the city in function to distances and means of transport. Parting from econometric estimations It is concluded that the duration of displacements is affected by the negatively covered distances and the mean of transportation (Collective Public Transportation and / or Transmilenio) indistinctively.