[TheAlchemist]

Not sure about RER, but if my memory is good, during RATP strikes in 2019, the automated line 1 was running every 60 seconds or so.

Paris has such a good public transport system, and now also cycling infrastructure, that something like 50% of young adults (<30y) don't even have a driving license !

[teractiveodular]

AFAIK the world record for this is held by Moscow, where some lines run every 80 seconds in regular schedules operation. That's departure to departure, and it's virtually impossible to go below that, because the speed of humans boarding becomes the limiting factor. Some automated lines claim 75 seconds as a theoretical limit, but AFAIK nobody actually does this.

[TheAlchemist]

Intersting, I've just googled a bit, and Ligne 1 in Paris was running every 90 seconds in peak hours, most other lines are around 100-110.