Soon no more need for the ile-de-france to have "eyes on their shows for fear of missing the last metro". In any event, one Saturday per month. From the night of Saturday 14 and Sunday 15 September, some lines of the paris metro, but also bus and tram will be open all night one Saturday per month for six months. Already active on nights of the new year's eve and the Feast of music, metro lines 1, 2, 5, 6, 9 and 14 as well as the lines T2, T3a and T3b tram will service the night of the month of September 2019 to march 2020 inclusive. In a fifty stations open, the subways work so non-stop from Saturday morning to Sunday, with a frequency of approximately 10 minutes. Chance of the calendar, this experiment starts the day after the massive strike that hit the paris subway this Friday.

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To Valérie Pécresse, president of the Region Ile-de-France, it is "to give back desire for Paris to get out and reinforce the attractiveness of Paris and the region," says the press release of the Ile-de-France Mobility.

The service bus Noctiliens will also be reinforced those nights. Since 2016, a plan of action to develop the lines of Noctiliens is in place. 25 lines have already been strengthened during the year 2017, which corresponds to a 28% increase in the number of buses, as well as a continuous increase of approximately 25% of the attendance.

in Order to guarantee service and security, more than 700 agents RATP (station attendants, drivers, security officers...) will be mobilised. An operation to "600.000 euros per night," admits Valerie Pécresse, but which corresponds to a "strong request" of the ile-de-france. A communication campaign will be deployed at the beginning of each month in public places in paris and on social networks, in order to remind the ile-de-france the dates of the experiment.