A 1-stop extension to the west towards "Quatre Routes" opened to the public in mid-2019. A further extension to the west towards Colombes (which would allow for a transfer with Line T2) is currently at the planning stage. To the east a planned extension towards Val de Fontenay, which has been blocked for several years due to strong opposition from the municipality of Noisy-le-Sec, will finally be constructed in two stages with the first phase connecting Noisy-le-Sec station to Montreuil ("Rue de Rosny") only.