Traffic information Bus
General bulletin 
RER 
Transilien 
Metro 
Tram 
Bus Afficher l'information de circulation d'une ligne
ok
Also worth reading
Metro line 14: closures in 2023
Works for adapting line 14 and its stations are continuing. This will require regular closures in 2023.
...
Metro line 4: closures in 2023
Works for adapting line 4 and its stations are continuing. This will require regular closures in 2023.
...