It was decided at the time to favour a "step by step" approach, by increasing the control of requirements and leaving for a later stage the controversial questions of travel time and density of loading.
Sel ajal otsustati eelistada järkjärgulist lähenemisviisi, suurendades nõuete kontrolli ning jättes vastuolulised küsimused sõiduaja ja laadimistiheduse kohta hilisemasse etappi.