All these numbers are very very low, when you consider that this is essentially how Parisian are supposed to go to and from work, get food, go to school, the de

All these numbers are very very low, when you consider that this is essentially how Parisian are supposed to go to and from work, get food, go to school, the dentist and so on. The best RER gets you late around 1 every 20 trip. So once every 2 weeks on average if you count two trips per day. The worse one doesn't get you on time almost every other day ! You basically have to factor the unreliability of the transport system every single trip. This is very far from something you can count on. Even for the best lines.