Announced last April, the decision to open lines of metro and tram one Saturday per month has just been validated by the council of the regional authority transport. The nights selected for this experiment are those from Saturday to Sunday, 14 September, 19 October, 9 November, 18 January, 15 February and 14 march.

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The goal is to "restore the desire for Paris to go out in the evening to Paris and close to crown while retaining the time necessary to the work" carried out most of the time at night on the network of the RATP," said this Tuesday the Ile-de-France Mobility (IDFM).

The entire transportation network is not affected by this experimentation. The subway lines 1, 2, 5, 6, 9, 14 roll every ten minutes, but only stop at certain stations. In addition, the tram lines 2, 3a, and 3b have a frequency of 20 minutes, and will mark all the stops. As for the night bus Noctilien, they will be sunken on the lines are busiest.

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"This consistency should allow the actors of the night to organise in order to promote the festivities of sufficient magnitude", noted IDFM, which reminds us that subways and trams roll already all night on new year's eve and the celebration of music.

The syndicat des transports d'ile-de-France, has, in principle, entitled to five openings the night a year and if this decision is a test phase, its extension is in the constraint part. In fact, the opening of the metro and the tram at night, on a larger scale, requires the establishment of social negotiations with the employees of the transportation network. The night is also a privileged time for the building interviews. However, there are "more than 400 each day," stated Valérie Pécresse, the president of the Region Ile-de-France, in an interview in the Paris .

In addition, a study commissioned by the Ile-de-France Mobility in 2016 shows that the demand for transportation decreases "considerably after midnight" while the cost of implementation of this service could range from 50 million to 100 million euros, depending on the number of stations served.