9.4Clutch disengagement :
All cars must be fitted with a means of disengaging the clutch for a minimum of fifteen minutes in the event of the car coming to rest with the engine stopped. This system must be in working order throughout the Event even if the main hydraulic, pneumatic or electrical systems on the car have failed. This system must also disconnect any ERS system fitted to the car.
In order that the driver or a marshal may activate the system in less than five seconds, the switch or button which operates it must :
a) Face upwards and be recessed into the top of the survival cell no more than 150mm from the car centre line.
b) Be designed in order that a marshal is unable to accidentally re-engage the clutch.
c) Be less than 150mm from the front of the cockpit opening.
d) Be marked with a letter "N" in red at least 40mm tall, with a line thickness of at least 4mm, inside a white circle of at least 50mm diameter with a red edge with a line thickness of at least 2mm.