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. In December 2003, the extension of Line 14 to Saint-Lazare resulted in a large increase of passengers using the station; within a year, the number of people using Saint-Lazare rose from 40.8 million to 64.1 million. Due to this, the chronic congestion of Line 13 has only worsened. Important economic development at the Plaine Saint-Denis around a vast urban project since the construction of the Stade de France has also worsened conditions on the line since a number of companies have moved there, forcing more employees to use the line for their commutes. In 2007, the delay of the automatic control system named Ouragan led the RATP to propose to STIF the employment of "pushers" (poussers, control assistants), responsible for smoother boarding and detraining at the busiest stations on Line 13. Interim measures Since December 2006, more than eighty additional trains have been added to provide supplemental service, a nearly 10% increase including additional Asnières branch service. Two years later, an automatic reversal at Châtillon-Montrouge went into effect, which reduces the turn-back time by ten seconds so as to circulate trains every 95 seconds. This has in turn required the installation of platform screen doors to prevent passengers from falling onto the tracks when no train operator is on board. On 17 December 2006, Line 13 has had its own command post and centralised control (poste de commande et de contrôle centralisé, PCC) managed from Malakoff. It involves the coordination of a number of officials to reduce the number of delays and incidents on the line. Since 29 July 2008, the PCC integrates the manoeuvre and start functions that were previously operated at each terminal. At the end of 2010, it was revealed that ten stations would receive platform screen door installation in an attempt to increase the average speed of trains and reduce track-related incidents. After a test a few