Line 13 is perhaps the least-appreciated line of the Métro by riders and is the object of a number of criticisms on part of its constant overcrowding, especially north of Saint-Lazare where the line splits in two, leading to reduced frequencies. It is not rare for passengers to wait for several trains to load before being able to board due to the sheer volume of users. Within trains, there may be up to 4.5 people per square metre, while the cars on Line 13 can only hold four people per square metre.