A comparison was then given between three different solutions: a tramway, an articulated bus and an articulated trolleybus. The study showed that the installation of a tramway would initially cost the most, but its operational cost per passenger would be lower after the first year and would attract more passengers. The balance sheet would be positive for this mode of transportation in less than 12 months of operation. The proposal highlighted the attractiveness of the modern tramway to the public. Its effect on urban planning was equally demonstrated with the rehabilitation of the neighbourhoods it served and reduced usage of the highways. On 28 October 1983 the proposal was approved by the "conseil d'administration" of the RATP. It was cosigned by the RATP and the DDE 93 in April 1984 and was also approved by the STIF. The project was thus included in regional planning.